You are told a lot about your education, but some beautiful, sacred memory, preserved since childhood, is perhaps the best education of all. If a man… - Fyodor Dostoyevsky

...I believe that you are sincere and good at heart. If you do not attain happiness, always remember that you are on the right road, and try not to leave it. Above all, avoid falsehood, every kind of falsehood, especially falseness to yourself. Watch over your own deceitfulness and look into it every hour, every minute. Avoid being scornful, both to others and to yourself. What seems to you bad within you will grow purer from the very fact of your observing it in yourself. Avoid fear, too, though fear is only the consequence of every sort of falsehood. Never be frightened at your own faint-heartedness in attaining love.

Every man has some reminiscences which he would not tell to everyone, but only to his friends. He has others which he would not reveal even to his friends, but only to himself, and that in secret. But finally there are still others which a man is even afraid to tell himself, and every decent man has a considerable number of such things stored away. That is, one can even say that the more decent he is, the greater the number of such things in his mind.

The man who has a conscience suffers whilst acknowledging his sin. That is his punishment.