vis major and fear, which destroy all power of choice. If you are free, if it lies with you to decide whether you will or not, then you will turn over in your own mind whether you will take a gift from a man or not; but if your position makes it impossible for you to choose, then be assured that you do not receive a gift, you merely obey orders. No one incurs any obligation by receiving what it was not in his power to refuse; if you want to know whether I wish to take it, arrange matters so that I have the power of saying “No.” “Yet suppose he gave you your life.” It does not matter what the gift was, unless it be given and received with good will: you are not my preserver because you have saved my life. Poison sometimes acts as a medicine, yet it is not on that account regarded as wholesome. Some things benefit us but put us under no obligation: for instance a man who intended to kill a tyrant, cut with his sword a tumour from which he suffered: yet the tyrant did not show him gratitude because by wounding him he had healed a disease which surgeons had feared to meddle with.