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

“‘As it was in the beginning, so it is now and ever shall be, into the ages of ages.’ Hence it is that every Master of a Lodge is called upon to swear that no innovation in the body of Masonry (i.e., in its substantial doctrine) is possible, since it already contains a minimum, and yet a sufficiency, of truth which none may add to nor alter, and from which none may take away” [via]