Time is the moving image of eternity. - Plato

Knowledge becomes evil if the aim be not virtuous.

I will tell you, in order that you may not share the impiety of the multitude: for there cannot conceivably be anything more impious or more to be guarded against than being mistaken in word and deed with regard to the gods, and after them, with regard to divine men; you must take very great precaution, whenever you are about to blame or praise a man, so as not to speak incorrectly. For this reason you must learn to distinguish honest and dishonest men: for God feels resentment when one blames a man who is like himself, or praises a man who is the opposite; and the former is the good man. For you must not suppose that while stocks and stones and birds and snakes are sacred, men are not; nay, the good man is the most sacred of all these things, and the wicked man is the most defiled.

And isn't it a bad thing to be deceived about the truth, and a good thing to know what the truth is? For I assume that by knowing the truth you mean knowing things as they really are.