Of all the things that are beyond my power, I value nothing more highly than to be allowed the honor of entering into bonds of friendship with people who sincerely love truth. For, of things beyond our power, I believe there is nothing in the world which we can love with tranquility except such men.

Love is nothing but Joy with the accompanying idea of an external cause (Ethics, part III, proposition 13, scholium).

In practical life we are compelled to follow what is most probable ; in speculative thought we are compelled to follow truth.

He who has a true idea simultaneously knows that he has a true idea, and cannot doubt of the truth of the thing perceived.

Falsity consists in the privation of knowledge, which inadequate, fragmentary, or confused ideas involve.

Be not astonished at new ideas; for it is well known to you that a thing does not therefore cease to be true because it is not accepted by many.