Experience without theory is blind, but theory without experience is mere intellectual play.

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• Live your life as though your every act were to become a universal law.

• All thought must, directly or indirectly, by way of certain characters, relate ultimately to intuitions, and therefore, with us, to sensibility, because in no other way can an object be given to us.

• Two things fill me with constantly increasing admiration and awe, the longer and more earnestly I reflect on them: the starry heavens without and the moral law within.

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

• Two things fill the mind with ever new and increasing admiration and awe...

  Two things fill the mind with ever new and increasing admiration and awe, the oftener and the more steadily we reflect on them: the starry heavens above and the moral law within. (transl.: Thomas Kingsmill Abbott) Zwei Dinge erfüllen das Gemüt mit immer neuer und zunehmender Bewunderung und Ehrfurcht...

• Act as if the maxim of your action were to become through your will a be general natural law.

• From such crooked wood as that which man is made of, nothing straight can be fashioned.

• Give me matter, and I will construct a world out of it!

• Out of timber so crooked as that from which man is made nothing entirely straight can be carved.

• There is, therefore, only one categorical imperative. It is: Act only according to that maxim by which you can at the same time will that it should become a universal law.