Men appear to prefer ruining one another's fortunes, and cutting each other's throats about a few paltry villages, to extending the grand means of human happiness.
The human brain is a complex organ with the wonderful power of enabling man to find reasons for continuing to believe whatever it is that he wants to believe.
Every man can educate himself. It's shameful to put one's mind into the hands of those whom you wouldn't entrust with your money. Dare to think for yourself.
It is proved...that things cannot be other than they are, for since everything was made for a purpose, it follows that everything is made for the best purpose.
Theological religion is the source of all imaginable follies and disturbances. It is the parent of fanaticism and civil discord; it is the enemy of mankind.