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

“Over the old temples of the Mysteries was written the injunction ‘Man, know thyself, and thou shalt know the universe and God.’ Happy then is the Mason who has so far purified and developed his own nature as to realize in its fulness the meaning of the ‘sacred symbol’ of the second degree, and found God present not outside but within himself.” [via]