Can somebody translate please?

Socrates:
There is only one thing that I know, and that is that I know nothing.

Gallileo:
You cannot teach a man anything, you can only help him learn on his own.

Lord Chesterfield:
Be wiser than other people, but dont tell them so.

Pope Alexander:
Men must be taught, as though you did not teach them,
and unknown things are proposed as forgotten things.