"The life of man is a perpetual flux of motion. All his thoughts, sentiments, and actions are in a continual succession, and never remain for any considerable time in the same state."

"The general rule is, that all objects, which are continguous in time and place, and betwixt which there is an original resemblance, are conceived as united by the imagination."

"Much human thought... is based on “a reasoning that is not in itself different from, nor founded on different principles, from that which appears” in animals."

"If we would satisfy ourselves, therefore, concerning the nature of that evidence, which assures us of matters of fact, we must enquire how we arrive at the knowledge of cause and effect."

"There is nothing in itself valuable or despicable, desirable or hateful, but as it acquires these attributes from the mind of the person who surveys it."