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

“All that has happened in the third degree is that he has symbolically passed through a great and striking change: a rebirth, or regeneration of his whole nature. He has been ‘sown a corruptible body’; and in virtue of the self-discipline and self-development he has undergone, there has been raised in him ‘an incorruptible body,’ and death has been swallowed up in the victory he has attained over himself.” [via]