Genius is the ability to independently arrive at and understand concepts that would normally have to be taught by another person.
Even if, by some especially unfortunate fate or by the niggardly provision of stepmotherly nature, [the good will] should be wholly lacking in the power to accomplish its purpose; if with the greatest...
Seek not the favor of the multitude; it is seldom got by honest and lawful means. But seek the testimony of few; and number not voices, but weigh them.
The whole interest of my reason, whether speculative or practical, is concentrated in the three following questions: What can I know? What should I do? What may I hope? (Critique of Pure Reason
He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals.
Settle, for sure and universally, what conduct will promote the happiness of a rational being.
Human beings are never to be treated as a means but always as ends.
The death of dogma is the birth of morality.
One who makes himself a worm cannot complain afterwards if people step on him.
I had therefore to remove knowledge, in order to make room for belief.
From the crooked timber of humanity, a straight board cannot be hewn.
Morality is not the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness.
Intuition and concepts constitute... the elements of all our knowledge, so that neither concepts without an intuition in some way corresponding to them, nor intuition without concepts, can yield knowl...
Happiness is not an ideal of reason, but of imagination.
It is beyond a doubt that all our knowledge begins with experience.
Simply to acquiesce in skepticism can never suffice to overcome the restlessness of reason.
Woman wants control, man self-control .
Religion is the recognition of all our duties as divine commands.
Even philosophers will praise war as ennobling mankind, forgetting the Greek who said: 'War is bad in that it begets more evil than it kills.'
An action, to have moral worth, must be done from duty.