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

“Under the name of Hiram, then, and beneath a veil of allegory, we see an allusion to another Master; and it is this Master, this Elder Brother who is alluded to in our lectures, whose ‘character we preserve, whether absent or present’, i.e., whether He is present to our minds or no, and in regard to whom we ‘adopt the excellent principle, silence,’ lest at any time there should be among us trained in some other than the Christian Faith, and to whom on that account the mention of the Christian Master’s name might possibly prove an offence or provoke contention.” [via]