For something to be "unleavened" means that it's been made without yeast. Since yeast is what makes bread rise and take on its airy texture, unleavened bread is relatively flat, dense and hard. The idea that unleavened bread is holy appears in both the Old and New Testaments and is still part of both Jewish and Christian traditions.

In the Word, bread represents the desire for what is good -- which gives us spiritual energy, just as bread gives us natural energy. Yeast, meanwhile, represents falsity -- so that bread made without yeast is a pure desire for good, free of falsity. This also makes sense because air represents our capacity to understand what's true -- which is the same capacity we use to embrace ideas that are false. Yeast causes bread to rise by producing gases as it ferments, thus adding "bad" air to the bread.

6971. 'And do not hear the voice of the former sign' means that if they did not obey what was declared by the Word, then instead of being spiritual and rational they would become people who were not spiritual or rational. This is clear from the meaning of 'hearing' as obeying, dealt with in 2542, 3869, 5017; from the meaning of 'the voice' as what is declared by the Word, dealt with below; and from the meaning of 'the former sign' as an indication that instead of being spiritual and rational they would become people who were not spiritual or rational. The truth of this may be seen from the meaning of 'the serpent' that was made out of Moses' rod when it was thrown onto the earth - the event to which 'the first sign' refers here - as a person who thinks on a sensory and bodily level, 6949, and so is not spiritual or rational. For a person who is sensory- and bodily-minded is not rational, and so is not spiritual either, because he thinks things that are false and desires those that are evil. One who behaves like this is not rational, still less spiritual, for an acceptance of and belief in what is true, together with a life of goodness, since these two come from the Divine, constitute true spirituality within rationality, whereas an acceptance of and belief in what is false, together with a life of evil, are the opposite. For the fact that wholly sensory- and bodily-minded people are like this, see 6844, 6845, 6948, 6949.

[2] Those people become wholly sensory- and bodily-minded who have first had a knowledge of things that belong to the spiritual world but after that have rejected them, and then have adopted fundamental ideas of falsity that are contrary to truths and focused their lives solely on worldly, bodily, and earthly values. They have consequently come to believe that life is meant to be filled with pleasures of every kind, saying, 'What more does a person have while he is alive? When we die, we die; as for the possibility of life after death, has anyone ever come back to talk about it? We have no knowledge of anything that will go on living when the life goes out of a person.' If anyone using rational arguments induces those people to give any thought to eternal life, they think that nothing worse will happen to them than to anyone else, and they immediately go back to living in the way they had done previously. With such people the passageway for the light of heaven to flow in is closed, and at the natural level of their minds the light of heaven is turned into thick darkness, while the light of the world there becomes brightness, 6907, a brightness that shines ever more brilliantly, the more that the light of heaven is darkened. This is why such people do not see the evil in their lives as anything other than goodness, or consequently the false ideas as anything other than true. Here then is the reason why a person becomes sensory- and bodily-minded. In short, once the way is opened for the light of heaven to flow in and then closed, a person is impelled to look downwards, and not upwards. This is done in keeping with Divine order so as to prevent truths once accepted and remaining in a person's inner self from being contaminated by falsities and thereby rendered profane.

[3] The same applies to gentiles who fall away from their religion, though their lot is better than that of people within the Church since what they possess are not truths from the Word, not genuine truths therefore but truths coupled with many misconceptions, which cannot be profaned in the way genuine ones can.

As regards the meaning of 'the voice' as that which is declared by the Word, it should be recognized that frequent use is made of the expression 'the voice'. It is also linked to other things that have nothing to do with a voice, such as the linking of it here to 'the sign' - 'If they do not hear the voice of the former sign they will believe the voice of the latter sign' - and also elsewhere, for example in Nahum,

The voice of the whip and the voice of the sound of the wheel. Nahum 3:2.

And in David,

The rivers have lifted up their voice, more than the voices of many mighty waters. Psalms 93:3-4.

[4] The fact that 'the voice' means a declaration, in the good sense a declaration by the Word, when it is called 'the voice of Jehovah', is clear in David,

The voice of Jehovah is powerful; the voice of Jehovah is glorious; the voice of Jehovah breaks the cedars; the voice of Jehovah flashes forth flames of fire; the voice of Jehovah causes the wilderness to shake; the voice of Jehovah causes the hinds to calve, and strips the forests bare. Psalms 29:3-5; Psalms 7-9.

And elsewhere in the same author,

. . . to Him who rides above the heavens of heavens of old. Behold, He will put forth His voice, a mighty voice. Psalms 68:33.

Here 'voice' stands for Divine Truth, and so for the Word and a declaration made by it. For what more is meant by 'voice', see 219; and for its use in reference to truth, 3563.

6907. 'That the king of Egypt will not allow you to go' means that falsity will set itself in opposition. This is clear from the meaning of 'not allowing you' as setting itself in opposition, for he who does not allow something when it is said to be a Divine command, 6903, and he who refuses to let someone worship God, sets himself in opposition, as is common among all those who are under the influence of falsity of which they have become firmly convinced; from the representation of Pharaoh or 'the king of Egypt' as falsity, dealt with in 6651, 6679, 6683; and from the meaning of 'to go' - that is to say, a three days' journey into the wilderness to sacrifice to Jehovah God - as to lead a life in keeping with truth in a state totally removed from falsities, and in so doing to worship the Lord, 6904.

[2] The situation when those under the influence of falsity, who are represented by 'the king of Egypt', set themselves against those guided by truths must be described. In the world those under the influence of falsity do not openly set themselves in opposition to those who are guided by truth, for they are held back from doing so by external restraints, which consist in the fear that others may see them as people who behave contrary to the laws of state and Church, in which case they would not seem to be good citizens. For everyone wishes the world to see him as righteous and true in outward appearance, and the wicked desire this more than the upright, in order that they may captivate people's minds and mislead them for reasons of gain and exalted positions. But inwardly they set themselves in opposition, for as often as they hear anyone proclaiming the truths of the Church not because it is his job to do so but because he loves them passionately, they laugh to themselves; and if at that time there were no external restraints to prevent them they would openly deride him. When such people enter the next life they are no longer held back by external restraints, since these are taken away from them in order that what each person is really like may be exposed to view. Then they openly set themselves in opposition to those who are guided by truths and molest them in every possible way; and this is now for them the absolute delight of their life. And when they are warned not to do such things because if they do not desist they will at length be removed completely and thrust down into hell, they nevertheless take no notice at all and carry on constantly with their molestation as before; for such is the strength of the delight they feel in living in accord with falsity. It takes them over so completely that they accept nothing whatever that makes for intelligence. These are the things that are meant by 'the king of Egypt will not allow you to go' and that are represented by Pharaoh's setting himself in opposition so many times. The removal of such spirits and the thrusting down of them into hell is represented by the destruction of Pharaoh and the Egyptians in the Sea Suph.

[3] Those who lead an evil life and are consequently under the influence of falsity see by the light of the world, since it is the light in which a person sees things with his understanding. With those who are under the influence of falsity arising from evil this light is glowing; and the more they are under the influence of falsity arising from evil, the brighter it glows. The glory of the world, which has its origin in self-love, is what ignites it and gives it its glow. This being so, those people see truths in that light as nothing but falsities, and falsities as nothing but truths. The reason for this is that this light's rays cannot be infused with heavenly light; with that kind of light heavenly light becomes thick darkness. This is why such people believe firmly but wrongly in falsities as against truths, for this is how that inferior light leads them to see falsities and truths in relation to each other. With those however who are guided by truths that spring from good the light of the world is not glowing but dim, while the light of heaven is with them brightly shining. And because it is brightly shining, truths in that light look like truths, and falsities like falsities. For when that light falls onto falsities, which look like truths in the light of the world separated from the light of heaven, it does not merely dim them but altogether blots them out. This light - the light of heaven - becomes gradually brighter and brighter with them, till at length it is so bright that the light of the world cannot be compared with it. From all this one may see why those who are steeped in falsities arising from evil set themselves, because of the great strength of their wrong belief, in opposition to those guided by truths, an opposition which has been described just above.