Those will be thy best friends, not to whom thou hast done good, but who have done good to thee. — Tacitus. Roman historian and senator (56–120) Friendship
Fear is not in the habit of speaking truth; when perfect sincerity is expected, perfect freedom must be allowed; nor has anyone who is apt to be angry when he hears the truth any cause to wonder that he does not hear it.
Abuse, if you slight it, will gradually die away; but if you show yourself irritated, you will be thought to have deserved it.
All enterprises that are entered into with indiscreet zeal may be pursued with great vigor at first, but are sure to collapse in the end.