Wherever morality is based on theology, wherever the right is made dependent on divine authority, the most immoral, unjust, infamous things can be justified and established.

Religion is the dream of the human mind. But even in dreams we do not find ourselves in emptiness or in heaven, but on earth, in the realm of reality; we only see real things in the entrancing splendor of imagination and caprice, instead of in the simple daylight of reality and necessity.

The first and highest law must be the love of man to man. Homo homini Deus est - this is the supreme practical maxim, this is the turning point of the world's History.

To theology, ... only what it holds sacred is true, whereas to philosophy, only what holds true is sacred.

Christianity has in fact long vanished, not only from the reason but also from the life of mankind, and it is nothing more than a fixed idea.

Man created God in his own image.

Faith is essentially intolerant ... essentially because necessarily bound up with faith is the illusion that one's cause is also God's cause.