What can I know? What ought I to do? What may I hope?

Freedom is the alone unoriginated birthright of man, and belongs to him by force of his humanity.

Prudence reproaches; conscience accuses.

Enlightenment is man's emergence from his self-incurred immaturity.

Whereas the beautiful is limited, the sublime is limitless, so that the mind in the presence of the sublime, attempting to imagine what it cannot, has pain in the failure but pleasure in contemplating the immensity of the attempt

Reason in a creature is a faculty of widening the rules and purposes of the use of all its powers far beyond natural instinct; it acknowledges no limits to its projects. Reason itself does not work instinctively, but requires trial, practice, and instruction in order gradually to progress from one level of insight to another.

Nature does nothing in vain, and in the use of means to her goals she is not prodigal.