Immanuel Kant

"Act only according to that maxim whereby you can at the same time will that it should become a universal law."

"Sapere aude! Dare to know! Have courage to use your own understanding."

"Two things awe me most: the starry sky above and the moral law within."

"Happiness is not an ideal of reason but of imagination."

"Out of the crooked timber of humanity, no straight thing was ever made."

"The only thing that is good without qualification is good will."

"Freedom is not the absence of necessity but the mastery of it."

"Man can become man only by education."

"We are not rich by what we possess but by what we can do without."

"Thoughts without content are empty; intuitions without concepts are blind."

"I am never afraid of what I know."

"Duty is the necessity of acting from respect for law."

"Act as if the maxim of your action were to become by your will a universal law of nature."

"The most important thing is to educate oneself."

"There is nothing higher than reason."

"Patience is the strength of the weak."

"In all judgments by which we describe anything as beautiful, we allow no one to be of a contrary opinion."

"The life which is unexamined is not worth living."

"Self-respect is a plant of slow growth."

"The starry heavens above fill me with wonder."

"A man is his own most important law."

"Science is organized knowledge."

"Peace is the only battle worth waging."

"The truth must finally be in a position to speak freely."

"Everything is created for a definite purpose."

"Blushing is the colour of virtue."

"Constant practice is the price of success."

"Act toward others as you wish others to act toward you."

"Experience without theory is blind; theory without experience is mere intellectual play."

"The light dove, cleaving the air in her free flight, might imagine that its flight would be still easier in a void space."