Baruch Spinoza — "The desire of knowing is the proper and most important property of the human min…"

"All things excellent are as difficult as they are rare."

"The human mind has no free will, but is determined to will this or that by a cause which is also determined by another cause, and this again by another, and so on to infinity."

"He who wishes to revenge injuries by reciprocal hatred will live in misery."

"The more the mind understands, the more capable it is of understanding other things."

"He who lives under the guidance of reason endeavours, as much as he can, to repay his fellow's hatred, anger, contempt, etc., with love and nobleness."