“By this freedom the will of a rational being, as belonging to the sensuous world, recognizes itself to be, like all other efficient causes, necessarily subject to the laws of causality, while in practical matters, in its other aspect as a being in itself, it is conscious of its existence as determinable in an intelligible order of things. It is conscious of this not by virtue of a particular intuition of itself but because of certain dynamic laws which determine its causality in the world of sense, for it has been sufficiently proved in another place that if freedom is attributed to us, it transfers us into an intelligible order of things."―from_Critique of Practical Reason_. Translated, with an Introduction by Lewis White Beck, p. 43.”

“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 knowledge.”

“I had therefore to remove knowledge, in order to make room for belief.”

“It is beyond a doubt that all our knowledge begins with experience.”

“Religion is the recognition of all our duties as divine commands.”

“Immaturity is the incapacity to use one's intelligence without the guidance of another.”

“It is not God's will merely that we should be happy, but that we should make ourselves happy.”

“Happiness is not an ideal of reason, but of imagination.”

“Morality is not the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness.”

“To be is to do.”

“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.'”