Aurelius, Meditations §aur_07_xx: Fancy not to thyself things future, as though they were present but of those ...

Fancy not to thyself things future, as though they were present but of those that are present, take some aside, that thou takest most benefit of, and consider of them particularly, how wonderfully thou wouldst want them, if they were not present. But take heed withal, lest that whilst thou dust settle thy contentment in things present, thou grow in time so to overprize them, as that the want of them (whensoever it shall so fall out) should be a trouble and a vexation unto thee. Wind up thyself into thyself. Such is the nature of thy reasonable commanding part, as that if it exercise justice, and have by that means tranquillity within itself, it doth rest fully satisfied with itself without any other thing.