36. People who have separated faith from love do not even know what faith is. When they do entertain an idea about faith, some of them see it only as mere thought, others as thought directed towards the Lord, and a few as the doctrine of faith. But faith involves not only knowledge of all the things that the doctrine of faith embraces and the acknowledgment of them; it is first and foremost obedience to everything that doctrine teaches. The primary point that it teaches for men's obedience is love of the Lord and love of the neighbour. Whoever is devoid of this is devoid of faith, a point which the Lord teaches so plainly in Mark as to leave absolutely no room for doubt,

The first of all the commandments is, Hear, O Israel, the Lord our God is one Lord. Therefore you shall love the Lord your God with all your heart, and with all your soul, and with all your mind, and with all your strength. This is the first commandment. The second is also like it, You shall love your neighbour as yourself. There is no other commandment greater than these. Mark 11:28-33.

In Matthew, He calls the former 'the first and great commandment', and says 'on these commandments the Law and Prophets depend', Matthew 22:35-40. The Law and the Prophets are the doctrine of faith in its entirety and the whole of the Word.

909. 'Birds' means things of his understanding and 'beasts' those of his will, [both of] which belong to the internal man; and 'every creeping thing that creeps over the earth' means corresponding things of a like nature residing with his external man. This becomes clear from the meaning of 'a bird', dealt with already in 40, 776, and of 'a beast' in 45, 46, 142, 143, 246. That 'creeping thing that creeps over the earth' means corresponding things residing with the external man is clear from this. Indeed 'creeping thing that creeps' here stands in relation both to 'birds', or things of the understanding, and to 'beasts', or those of the will. The most ancient people used to call the sensory powers and the appetites of the body 'creeping things that creep' because they are indeed just like reptiles that creep along the ground. They also likened the human body to the earth or to the ground. Indeed they actually called it the earth or the ground, as in the present verse where nothing other than the external man is meant by 'the earth'.