The Position and Possibilities of the Masonic Order from The Meaning of Masonry by Walter Leslie Wilmshurst.

“The Order is a semi-secret, semi-public institution; secret in respect of its activities intra moenia, but otherwise of full public notoriety, with its doors open to any applicant for admission who is of ordinary good character and repute. Those who enter it, as the majority do, entirely ignorant of what they will find there, usually because they have friends there or know Masonry to be an institution devoted to high ideals and benevolence and with which it may be socially desirable to be connected, may or may not be attracted and profit by what is disclosed to them, and may or may not see anything beyond the bare form of the symbol or hear anything beyond the mere letter of the word.” [via]