Men will find that they can ... avoid far more easily the perils which beset them on all sides by united action.

Whatsoever is contrary to nature is contrary to reason, and whatsoever is contrary to reason is absurd.

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.

One and the same thing can at the same time be good, bad, and indifferent, e.g., music is good to the melancholy, bad to those who mourn, and neither good nor bad to the deaf.

God is the indwelling and not the transient cause of all things.

I should attempt to treat human vice and folly geometrically... the passions of hatred, anger, envy, and so on, considered in themselves, follow from the necessity and efficacy of nature... I shall, therefore, treat the nature and strength of the emotion in exactly the same manner, as though I were concerned with lines, planes, and solids.

The more clearly you understand yourself and your emotions, the more you become a lover of what is.