Francis Bacon Quote

Speech of a man's self ought to be seldom and well chosen. I knew one was wont to say in scorn, "He must needs be a wise man, he speaks so much of himself." There is but one case wherein a man may commend himself with good grace, and that is in commending virtue in another, especially if it be a virtue where unto himself pretendeth.

Forty Thousand Quotations: Prose and Poetical (1917)