one should
Examples
The first to enter heaven was a thief. And the first to enter hell was an apostle of Christ. And how all this happened is a great lesson for us. Therefore, one should never despair nor give up on another.
One should not say that it is impossible to reach a virtuous life; but one should say that it is not easy. Nor do those who have reached it find it easy to maintain.
One should attend to one's enemies, for they are the first persons to detect one's errors.
One should rise to a person who sees you sitting.
Keep five yards from a carriage, ten yards from a horse, and a hundred yards from an elephant; but the distance one should keep from a wicked man cannot be measured.
Having drunk the country's water, one should obey the country's laws.