The Deeper Symbolism of Freemasonry from The Meaning of Masonry by Walter Leslie Wilmshurst.

“The Ceremony of our first degree, then, is a swift and comprehensive portrayal of the entrance of all men into, first, physical life, and second, into spiritual life; and as we extend congratulations when a child is born into the world, so also we receive with acclamation the candidate for Masonry who, symbolically, is seeking for spiritual re-birth” [via]