Enlightenment is the liberation of man from his self-caused state of minority... Supere aude! Dare to use your own understanding!is thus the motto of the Enlightenment.

He who has made great moral progress ceases to pray

The ideal of the supreme being is nothing but a regulative principle of reason which directs us to look upon all connection in the world as if it originated from an all-sufficient necessary cause.

Deaths, births, and marriages, considering how much they are separately dependent on the freedom of the human will, should seem to be subject to no law according to which any calculation could be made beforehand of their amount; and yet the yearly registers of these events in great countries prove that they go on with as much conformity to the laws of nature as the oscillations of the weather.

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

You only know me as you see me, not as I actually am

The more we come in contact with animals and observe their behaviour, the more we love them, for we see how great is their care of the young.