Kant, Immanuel

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

"The human being is an end in himself, not a means."

"Radicalism is not simply the wish to change; it is the wish to go to the root of things."

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

"A man is rich in proportion to the number of things he can afford to let alone."

"Brevity of speech combined with length of thought is a rare combination."

"The starry heavens awaken a sense of wonder and awe."

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

"The human mind is a strange and wonderful thing."

"Law, like custom, is the guardian of social order."

"The universe operates according to laws that our reason can apprehend."

"To act morally is to act from duty, not merely from inclination."

"A liar makes nothing true or false by his utterances."

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

"Man's freedom of choice is the foundation of his dignity."

"Beauty is purposiveness without purpose."

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

"Lying is always wrong, regardless of circumstances or consequences."

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

"Music speaks to the soul when words fail."

"The recognition of duty is the consciousness of obligation."

"Liberty is the art of understanding."

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

"The good man must be one who endeavors to cultivate virtue in himself and others."

"Truth requires the courage to speak what you believe to be true."

"Criticism of religion is the prerequisite to rational faith."

"The imagination cannot be taught, only developed."

"History is the record of the development of human freedom."

"The essence of virtue is not obedience, but autonomy."

"Nature does nothing without purpose or effect."