Let no one ignorant of Mathematics enter here.

Books are immortal sons deifying their sires.

For the introduction of a new kind of music must be shunned as imperiling the whole state; since styles of music are never disturbed without affecting the most important political institutions.

For a poet is an airy thing, winged and holy, and he is not able to make poetry until he becomes inspired and goes out of his mind and his intellect is no longer in him.

I know too well that these arguments from probabilities are imposters, and unless great caution is observed in the use of them, they are apt to be deceptive.

So their combinations with themselves and with each other give rise to endless complexities, which anyone who is to give a likely account of reality must survey.

Ignorance: the root of all evil.