From Arcana Coelestia ~ Emanuel Swedenborg
The spiritual in its first origin is the Divine truth proceeding from the Lord's Divine Human; which truth has in it Divine good, because the Divine truth comes forth from the Lord's Divine Human, which is Divine good. The Divine truth, in which is Divine good, is the spiritual itself in its origin, and is the life itself which fills heaven, nay, which fills the universe; and where there is a subject, there it flows in. But in its subjects it is varied according to their form. In the subjects which agree with good, it presents spiritual life; but in the subjects which disagree with good, it presents life opposed to spiritual life, which in the Word is called "death." From this it is now plain what spiritual life is, namely, that it is to be in truths from good, which proceed from the Lord.
(Arcana Coelestia 6685)
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...man's regeneration is an image of the Lord's glorification. A man who is being regenerated, like the man who is born, passes through the ages - infancy, childhood, youth or early manhood, and adult age; for a man who is being regenerated is born anew. When he is an infant, the truths in him have indeed life, but not yet spiritual life. It is only general truths without particulars and singulars with which good is then conjoined; consequently there is only exterior conjunction, not interior. Interior conjunction is effected successively, as the man advances into the following ages. It is the state of this infancy which is signified by the children being tender, and also by the words which now follow: "and the flocks and the herds are suckling with me, and if they drive them on in one day, all the flocks will die."
(Arcana Coelestia 4377)