Immanuel Kant

"Nature operates according to laws that reason can discover."

"Marriage should be based on duty, not passion."

"The human being is a microcosm of the universe."

"Perpetual peace requires a federation of free republics."

"Beauty is the symbol of the morally good."

"We see only what we are prepared to see."

"The practical problems of ethics cannot be divorced from metaphysics."

"Our intellect shapes our experience of reality."

"Dignity is that which has no price."

"The will alone determines the moral worth of an action."

"To be free is to act in accordance with reason."

"Truth cannot be subjective; it is objective or it is not truth."

"The evil in human nature comes from our tendency to prioritize self-interest."

"Every person has inherent dignity that cannot be bought or sold."

"Science seeks to explain the mechanisms of nature, but not its purpose."

"The concept of God is a regulative ideal, not a constitutive principle."

"Our duty is to perfect ourselves morally throughout our lives."

"Judgment is the highest intellectual faculty."

"Without competition, excellence cannot flourish."

"The human being is the only creature capable of moral accountability."

"Sensibility and reason must work together in human understanding."

"A just society protects the rights of all its members equally."

"The pursuit of knowledge is the noblest of human endeavors."

"What we take to be objective truth is structured by our minds."

"To deny our emotions is to deny part of our humanity."

"The aesthetic judgment is neither purely subjective nor purely objective."

"We are condemned to be free; freedom is an inescapable burden."

"Education aims at the development of moral character, not mere knowledge."

"The noumenal world is forever beyond the reach of human knowledge."

"Our sense of duty is the foundation of all morality."