As touching the gods, I do not know whether they exist or not, nor how they are featured; for there is much to prevent our knowing: the obscurity of the subject and the brevity of human life.
Opening lines of Concerning the Gods (DK 80 B4).
Man is the measure of all things, of the existence of the things that are, and the non-existence of the things that are not.Protagoras
He said that there is no art without practice, and no practice without art.Protagoras
Concerning the gods I am not in a position to know either that they are or that they are not, or what theyare like in appearance; for there are many things that are preventing knowledge, the obscurity of the matter and the brevity of human life.Protagoras
Man is the measure of all things: of things which are, that they are, and of things which are not, that they are not.Protagoras
There are two sides to every question.Protagoras
When it comes to consideration of how to do well in running the city, which must proceed entirely through justice and soundness of mind.Protagoras
You, Socrates, began by saying that virtue can't be taught, and now you are insisting on the opposite, trying to show that all things are knowledge, justice, soundness of mind, even courage, from which it would follow that virtue most certainly can be taught.Protagoras