I am myself by inclination an investigator.

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

Thrift is care and scruple in the spending of one's means. It is not a virtue and it requires neither skill nor talent.

The infinitude of creation is great enough to make a world, or a Milky Way of worlds, look in comparison with it what a flower or an insect does in comparison with the Earth.

Notion without intuition is empty, intuition without notion is blind.

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.

But only he who, himself enlightened, is not afraid of shadows.