Wherefore, O ye sons and scions of the softer Muses, first of all show your songs to the magistrates, and let them compare them with our own, and if they are the same or better we will give you a chorus; but if not, then, my friends, we cannot.

Let these, then, be the customs ordained by law about all dances and the teaching of them, and let matters relating to slaves be separated from those relating to masters, if you do not object.
CLEINIAS: We can have no hesitation in assenting when you put the matter thus.
ATHENIAN: There still remain three studies suitable for freemen.
Arithmetic is one of them; the measurement of length, surface, and depth is the second; and the third has to do with the revolutions of the stars in relation to one another.

Not every one has need to toil through all these things in a strictly scientific manner, but only a few, and who they are to be we will hereafter indicate at the end, which will be the proper place; not to know what is necessary for mankind in general, and what is the truth, is disgraceful to every one: and yet to enter into these matters minutely is neither easy, nor at all possible for every one; but there is something in them which is necessary and cannot be set aside, and probably he who made the proverb about God originally had this in view when he said, that 'not even God himself can fight against necessity;' he meant, if I am not mistaken, divine necessity; for as to the human necessities of which the many speak, when they talk in this manner, nothing can be more ridiculous than such an application of the words.
CLEINIAS: And what necessities of knowledge are there, Stranger, which are divine and not human?
ATHENIAN: I conceive them to be those of which he who has no use nor any knowledge at all cannot be a God, or demi-god, or hero to mankind, or able to take any serious thought or charge of them.

And very unlike a divine man would he be, who is unable to count one, two, three, or to distinguish odd and even numbers, or is unable to count at all, or reckon night and day, and who is totally unacquainted with the revolution of the sun and moon, and the other stars.

There would be great folly in supposing that all these are not necessary parts of knowledge to him who intends to know anything about the highest kinds of knowledge; but which these are, and how many there are of them, and when they are to be learned, and what is to be learned together and what apart, and the whole correlation of them, must be rightly apprehended first; and these leading the way we may proceed to the other parts of knowledge.