Who said “I'm a pessimist because of intelligence, but an optimist because of will.”?

“My sun sets to rise again.”

“Optimism is the opium of the people.”

“Let other pens dwell on guilt and misery.”

“One could do worse than be a swinger of birches.”

“I believe that man will not merely endure; he will prevail.”

“I turn and turn in my cell like a fly that doesn't know where to die.”

“If you think about it seriously, all the questions about the soul and the immortality of the soul and paradise and hell are at bottom only a way of seeing this very simple fact: that every action of ours is passed on to others according to its value, of good or evil, it passes from father to son, from one generation to the next, in a perpetual movement.”

“I would like you to understand completely, also emotionally, that I'm a political detainee and will be a political prisoner, that I have nothing now or in the future to be ashamed of in this situation. That, at bottom, I myself have in a certain sense asked for this detention and this sentence, because I've always refused to change my opinion, for which I would be willing to give my life and not just remain in prison. That therefore I can only be tranquil and content with myself.”

“In the life of children there are two very clear-cut phases, before and after puberty. Before puberty the child's personality has not yet formed and it is easier to guide its life and make it acquire specific habits of order, discipline, and work: after puberty the personality develops impetuously and all extraneous intervention becomes odious, tyrannical, insufferable. Now it so happens that parents feel the responsibility towards their children precisely during this second period, when it is too late: then of course the stick and violence enter the scene and yield very few results indeed. Why not instead take an interest in the child during the first period?”