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

[...] the understanding is capable of being instructed by and equipped with rules, the power of judgement is a special talent which cannot be taught, but can be practised. This is why power of judgement is the specific mark of our so-called native wit, the absence of which cannot be remedied by any schooling.

The public use of a man's reason must be free at all times, and this alone can bring enlightenment among men...

It is beyond doubt that all knowledge begins with experience.