The flute is not an instrument that has a good moral effect - it is too exciting.

Twice and thrice over, as they say, good is it to repeat and review what is good.

I can show you that the art of calculation has to do with odd and even numbers in their numerical relations to themselves and to each other.

Knowledge of the soul is the only universal truth and the only wisdom - all other knowledge is transient.

Science is nothing but perception.

What a poor appearance the tales of poets make when stripped of the colours which music puts upon them, and recited in simple prose.

So where it is a general rule that it is wrong to gratify lovers, this can be attributed to the defects of those who make that rule: the government's lust for rule and the subjects' cowardice.