Nothing happens to any man which he is not formed by nature to bear. The same things happen to another, and either because he does not see that they have happened, or because he would show a great spirit, he is firm and remains unharmed. It is a shame then that ignorance and conceit should be stronger than wisdom. Things themselves touch not the soul, not in the least degree; nor have they admission to the soul, nor can they turn or move the soul: but the soul turns and moves itself alone, and whatever judgments it may think proper to make, such it makes for itself the things which present themselves to it.
Marcus Aurelius, in 'Meditations'
