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

“For it is impossible to-day, as it was impossible in ancient times, for a man to reach the heights of moral perfection and spiritual consciousness which were then, and are now, the goal and aim of all the schools of the Mysteries and all the secret orders, without purification and trial. Complete stainlessness of body, utter purity of mind, are absolute essentials to the attainment of things of great and final moment.” [via]