Discretion of speech is more than eloquence, and to speak agreeably to him with whom we deal is more than to speak in good words, or in good order.

Never wrestle with a strong man nor bring a rich man to court.

Be advised what thou dost discourse of, and what thou maintainest whether touching religion, state, or vanity; for if thou err in the first, thou shalt be accounted profane; if in the second, dangerous; if in the third, indiscreet and foolish.

Never say "oops" in the operating room.