Immanuel Kant

Metaphysics is but a dark ocean without shores or lighthouse, strewn with many a philosophic wreck

It is not necessary that whilst I live I live happily, but is necessary that so long as I live I should live honorably

Do what is right, though the whole world may perish

It is not God's Will merely that, we should be happy, but that we should make ourselves happy

Science is organized knowledge. Wisdom is an organized life

Morality is not the doctrine of how we can make ourselves happy, but how we may make ourselves worthy of happiness

By a lie a man throws away and, as it were, annihilates his own dignity as a man

All thought must, directly or indirectly, by way of certain characters, relate ultimately to intuitions, and therefore, with us, to sensibility; in no other way can an object be given to us

Two things awe me most, the starry sky above me, and the moral law within me.

The only objects of practical reason are therefore those of good and evil. For by the former is meant an object necessarily desired according to a principle of reason, by the latter, one necessarily shunned, also according to a principle of reason

Act that your principle of action might be made a law for the whole world.

No one can compel me to be happy in accordance with his idea of the welfare of others, for each may seek his happiness in whatever way he sees fit, so long as he does not infringe upon the freedom of others to pursue a similar end which can be reconciled with the freedom of everyone else within a workable general law , he must give to others the same right as he enjoys himself

Immaturity ,is the incapacity to use one's intelligence without the guidance of another