A categorical imperative would be one which represented an action as objectively necessary in itself, without reference to any other purpose.

Great minds think for themselves.

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.

Look closely. The beautiful may be small.

THERE ARE TWO THINGS that don't have to mean anything, one is music and the other is laughter.

The light dove, cleaving the air in her free flight, and feeling its resistance, might imagine that its flight would be still easier in empty space.

Freedom can never be comprehended, nor even can insight into it be gained.