"It is impossible for a man to be affected by any emotion unless he imagines something which excludes the existence of an external cause of that emotion."

"The intellectual love of God is eternal, and it is the highest good of the mind."

"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."

"Things which are really different are distinguished from each other, either by the difference of their attributes, or by the difference of their modifications."

"Nothing comes into being out of nothing."