Plato — "The worst of all deceptions is self-deception."

"The poets, beginning with Homer, are to be banished from the ideal city because they appeal to the emotions and irrational parts of the soul, and distort the truth."

"Do not train a child to learn by force or harshness; but direct them to it by what amuses their minds, so that you may be better able to discover with accuracy the peculiar bent of the genius of each."

"The greatest penalty of evildoing is to grow into the likeness of bad men."

"States are as men are; they grow out of human characters."

"Musical innovation is full of danger to the State, for when modes of music change, the fundamental laws of the State always change with them."