Psalm 23 is undoubtedly the most well-known and well-loved of all the psalms, with its illustration of the Lord as our shepherd. The shepherd's care for his sheep is, internally, describing the things that the Lord does for us in our spiritual journey.

As the psalm unfolds we hear about the Lord’s work for us, during states in our lives when we could be unsure and afraid, and of the Lord’s provision for us. Gradually the psalmist confirms his trust in the Lord’s guidance and declares the many blessings the Lord brings.

This psalm of six verses would surely have been known and loved by the Lord during his life in the world. It would have, for him, been a statement of faith in his purpose to overcome evil and glorify his humanity. Jesus, in states where his human heredity was strong in his mind, would have regarded his own divinity as his shepherd, and seen it as his anchor and provider. For us, spiritually, the same parallel applies -- that our faith in the Lord is to be our trust and guide at all times.

The shepherding care in verses 2 and 3 speaks about how the Lord leads us into acquiring new truths that bring heavenly peace and rest for us. Our state is lifted up and we live in goodness because we understand that this is the divine quality that God wishes for us to live by. (See Apocalypse Explained 375 and Arcana Caelestia 3696)

The valley of the shadow of death describes our states of being afraid, and of not seeing the Lord with us, during which our mind can be filled with disturbing and mocking thoughts. But we know that the Lord is there with us nonetheless. The “rod” and “staff” represent the power of the Lord’s truths for us to use; a rod - used actively to guard the sheep - stands for spiritual truths, and a staff is leaned on, representing natural truths or truths to do with life.”

(Apocalypse Explained 727)

With the provision of truth from the Lord, the psalm shifts to the picture of the bounteous table which truth brings to us as our spiritual nourishment and satisfaction. Our head anointed with oil has many associations of being the Lord’s chosen, of being loved and blessed by the Lord, and of how our mind with its understanding receives love and good to make it full of heavenly joy. “My cup runs over” means the unknown extent of the truths of the Word and the blessings of the Lord. (Apocalypse Explained 727)

The final verse is put in terms of our full conviction of being in the Lord for ever and in all the days of our lives. What we experience and say in terms of time and duration spiritually means what is certain, perpetual and to all eternity. The ‘house of the Lord’ is heaven. (Arcana Caelestia 650)

387. And with death, signifies the consequent extinction of spiritual life. This is evident from the signification of "death," as being the extinction of spiritual life (See above, n. 78, 186). That this is what "death" here signifies is evident from the series of things in the internal sense; for it is said that "there was given unto them power to kill with sword, with famine, and with death;" and "sword" signifies falsity destroying truth, "famine" the deprivation of the knowledges of truth and good; thence "death" signifies the extinction of spiritual life; for where falsity reigns, and where there are no knowledges of truth and good, there is no spiritual life, for spiritual life is acquired by means of the knowledges of truth and good applied to the uses of life. For man is born into all evil and falsity from evil; he is therefore born also into an entire ignorance of all spiritual knowledges; therefore in order that he may be led away from the evils and consequent falsities into which he is born, and be led into the life of heaven and be saved, he must needs acquire the knowledges of truth and good, by means of which he can be led into spiritual life and become spiritual. From this series of things in the internal sense it is evident that "death" here signifies the extinction of spiritual life; this is meant, too, by spiritual death.