Philosophy Quotes

"A true material substance which is extended, figured, and movable appears to the mind only as ideas."

"The mind exists only as a perceiving being; it cannot be material."

"Whatever the mind apprehends, it apprehends as an idea."

"The world is not independent of the mind but exists in it."

"Man is not a machine but a spiritual being capable of reason and love."

"Every effect must have a cause, and that cause must be God or mind."

"The mind that is constantly changing has never truly understood anything."

"I have always thought the actions of men the best interpreters of their thoughts."

"All certainty arises from comparison of ideas."

"The acts of the mind are chiefly volitions and perceptions, or thoughts."

"The corruption of the best things produces the worst."

"There are no accidents in nature, only causes."

"To be is to be perceived."

"Nothing happens without sufficient reason."

"Every individual substance contains in its concept all of its events."

"Every person has infinite worth."

"Philosophy seeks to understand existence."

"The categorical imperative is the principle that one should act only according to that maxim whereby you can at the same time will that it should become a universal law."

"Nothing is divine except what is moral."

"The practical man is a theorist upon a small scale."

"Man is the sole being that finds his own being problematic."

"Space and time are forms of human sensibility, not properties of things in themselves."

"We must always take seriously the questions posed by reason."

"Abortion is the murder of a human being already in existence."

"Human actions can be compared to the behavior of animals only insofar as they exhibit the same mechanical laws."

"The concept of the good must precede the determination of moral law."

"The will of man is not guided by knowledge alone, but also by feeling and appetite."

"The idea of personal identity persists through all changes."

"All the interests of my reason converge on three questions: What can I know? What should I do? What may I hope?"

"Reason is the faculty of universal principles."