True opinions are a fine thing and do all sorts of good so long as they stay in their place; but they will not stay long. They run away from a man's mind, so they are not worth much until you tether them by working out the reason. Once they are tied down, they become knowledge, and are stable.
PlatoI do not live to play, but I play in order that I may live, and return with greater zest to the labors of life.
PlatoFor this feeling of wonder shows that you are a philosopher, since wonder is the only beginning of philosophy.
PlatoThere is no necessity for the man who means to be an orator to understand what is really just but only what would appear so to the majority of those who will give judgment; and not what is really good or beautiful but whatever will appear so; because persuasion comes from that and not from the truth.
PlatoFor just as poets love their own works, and fathers their own children, in the same way those who have created a fortune value their money, not merely for its uses, like other persons, but because it is their own production. This makes them moreover disagreeable companions, because they will praise nothing but riches.
Plato