We are bound to our bodies like an oyster to its shell.

The doctors will treat those of your citizens whose physical and psychological constitution is good: as for the others, they will leave the unhealthy to die and those whose psychological constitution is incurably warped they will be put to death.

'But the man who is ready to taste every form of knowledge, is glad to learn and never satisfied - he's the man who deserves to be called a philosopher, isn't he?'

A person who is good for anything ought not to calculate the chance of living or dying; he or she ought only to consider whether in doing anything he or she is doing right or wrong- acting the part of a good person or a bad person.

A library of wisdom, is more precious than all wealth, and all things that are desirable cannot be compared to it. Whoever therefore claims to be zealous of truth, of happiness, of wisdom or knowledge, must become a lover of books.

You are mistaken, my friend, if you think that a man who is worth anything ought to spend his time weighing up the prospects of life and death. He has only one thing to consider in performing any action - that is, whether he is acting rightly or wrongly, like a good man or a bad one.

A good decision is based on knowledge, and not on numbers.