Immanuel Kant

"Habit is second nature, but morality must be first."

"The greatest weapon against ignorance is education."

"We are rational beings, and reason demands consistency."

"The good will is good in itself, regardless of consequences."

"Our judgments about beauty are subjective yet universal."

"True strength lies in self-control and moral integrity."

"The mind is not a passive receptacle but an active force."

"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."

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

"I have to deny knowledge in order to make room for faith."

"A categorical imperative would be a proposition which represented an action as objectively necessary."

"The only thing that could ever be called absolutely good is the good will."

"Man can become man only through education."

"Enlightenment is man's emergence from his self-incurred immaturity."

"Freedom is not the ability to do whatever you want, but the strength to do what is right."

"Treat humanity always as an end in itself, never merely as a means."

"The fundamental principle of morality is the categorical imperative."

"In the end things will mend, for better or worse."

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

"There is nothing higher than reason."

"The starry heavens above fill me with awe; the moral law within fills me with wonder."

"Patience is a virtue that cannot be learned in a hurry."

"He who is cruel to animals becomes hard also in his dealings with men."

"The beautiful is that which, without interest, pleases universally."

"Persecution may wear down my body, but it cannot touch my soul."

"To be is to do."

"The existence of God cannot be proven rationally."

"A human being should be valued for what he is, not what he has."