We are all working together to one end, some with knowledge and design, and others without knowing what they do; as men also when they are asleep, of whom it is Heraclitus, I think, who says that they are labourers and co-operators in the things which take place in the universe. But men co-operate after different fashions: and even those co-operate abundantly, who find fault with what happens and those who try to oppose it and to hinder it; for the universe had need even of such men as these. It remains then for thee to understand among what kind of workmen thou placest thyself; for he who rules all things will certainly make a right use of thee, and he will receive thee among some part of the co-operators and of those whose labours conduce to one end. But be not thou such a part as the mean and ridiculous verse in the play, which Chrysippus speaks of.
Alexander and Gaius and Pompeius, what are they in comparison with Diogenes and Heraclitus and Socrates? For they were acquainted with things, and their causes (forms), and their matter, and the ruling principles of these men were the same. But as to the others, how many things had they to care for, and to how many things were they slaves?