Discipline is the soul of an army. It makes small numbers formidable; procures success to the weak, and esteem to all.
You have power over your mind — not outside events. Realize this, and you will find strength.
Keep the faculty of effort alive in you by a little gratuitous exercise every day. That is, be systematically ascetic or heroic in little unnecessary points, do every day or two something for no other reason than that you would rather not do it, so that when the hour of dire need draws nigh, it may find you not unnerved and untrained to stand the test. So with the man who has daily inured himself to habits of concentrated attention, energetic volition, and self-denial in unnecessary things. He will stand like a tower when everything rocks around him, and when his softer fellow-mortals are winnowed like chaff in the blast.
Old age, which is dreaded by all men, is to me the sweetest and most pleasant period of my life.
It is certain that habit eventually has such power over human nature that it becomes, as it were, a second nature, and forces it to practise that to which it has become accustomed, regardless of whether or not it is good for health.
O wretched, miserable life! O unhappy temperament! To think that I, a man of sense, should have allowed myself to be brought to such a state by sensuality! Not to mention the pains in my stomach, my sides, and other parts of my body.