Do what is right, though the world may perish.
Act only according to that maxim whereby you can at the same time will that it should become a universal law.
Nature, when left to universal laws, tends to produce regularity out of chaos.
But only he who, himself enlightened, is not afraid of shadows.
Two things fill the mind with ever new and increasing admiration and awe, the oftener and more steadily we reflect on them: the starry heavens above me and the moral law within me.
We can never, even by the strictest examination, get completely behind the secret springs of action.