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

“In all periods the world’s history, and in every part of the globe, the secret orders and societies have existed outside the limits of the official churches for the purpose of teaching what are called ‘the Mysteries’: for imparting to suitable and prepared minds certain truths of human life, certain instructions about divine things, about the things that belong to our peace, about human nature and human destiny, which it was undesirable to publish to the multitude who would but profane those teachings and apply the esoteric knowledge that was communicated to perverse and perhaps to disastrous ends.” [via]