Accept nothing pleasant unless it is beneficial.
One man means as much to me as a multitude, and a multitude only as much as one man.
Men achieve cheerfulness by moderation in pleasure and by proportion in their life excess and deficiency are apt to fluctuate and cause great changes in the soul. And souls which change over great intervals are neither stable nor cheerful. So one should set one’s mind on what is possible and be content with what one has taking little account of those who are admired and envied and not dwelling on them in thought but one should consider the lives of those who are in distress thinking of their grievous sufferings so that what one has and possesses will seem great and enviable and one will cease to suffer in one’s soul through the desire for more.
One will seem to promote virtue better by using encouragement and persuasion of speech than law and necessity. For it is likely that he who is held back from wrongdoing by law will err in secret but that he who is urged to what he should by persuasion will do nothing wrong either in secret or openly. Therefore he who acts rightly from understanding and knowledge proves to be at the same time courageous and right-minded.
No one regards the things before his feet, But views with care the regions of the sky.
No power and no treasure can outweigh the extension of our knowledge.
Good means not merely not to do wrong, but rather not to desire to do wrong.