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

“And by these finally he will discern how that there is a mystical ‘ladder of many rounds or staves,’ i.e., that there are innumerable paths or methods by means of which men are led upwards to the spiritual Light encircling us all, and in which we live and move and have our being, but that of the three principal methods, the greatest of these, the one that comprehends them all and brings us nearest heaven, is Love, in the full exercise of which God-like virtue a Mason reaches the summit of his profession; that summit being God Himself, whose name is Love.” [via]