You will never do anything in this world without courage. It is the greatest quality of the mind next to honor.

Plato is my friend, but truth is a better friend.

Neither by nature, then, nor contrary to nature do the virtues arise in us; rather we are adapted by nature to receive them, and are made perfect by habit.

Men regard it as their right to return evil for evil and, if they cannot, feel they have lost their liberty.

Memory is the scribe of the soul.

Whether if soul did not exist time would exist or not, is a question that may fairly be asked; for if there cannot be someone to count there cannot be anything that can be counted, so that evidently there cannot be number; for number is either what has been, or what can be, counted.

It is Homer who has chiefly taught other poets the art of telling lies skillfully.