Nothing which has entered into our experience is ever lost. – William Ellery Channing

There is no more lively sensation than that of pain its impressions are certain and dependable, they never deceive as may those of the pleasure women perpetually feign and almost never experience. – Marquis de Sade

Is there anyone so wise as to learn by the experience of others? – Voltaire

Men are wise in proportion, not to their experience, but to their capacity for experience. – George Bernard Shaw