Leo Tolstoy

Human beings are like rivers; the water is one and the same in all of them but every river is narrow in some places, flows swifter in others; here it is broad, there still, or clear, or cold, or muddy or warm. It is the same with men. Every man bears within him the germs of every human quality, and now manifests one, now another, and frequently is quite unlike himself, while still remaining the same man.