"Nature has no end in view, and all final causes are nothing but human figments."

"He who wishes to revenge injuries by retaliating them, will live in a circle of hatred."

"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."

"Nothing comes into being out of nothing."

"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."