Religion is "so absurd that it comes close to imbecility."

Voting is simply a way of determining which side is the stronger without putting it to the test of fighting.

The truth is that Christian theology, like every other theology, is not only opposed to the scientific spirit; it is also opposed to all other attempts at rational thinking.

The average schoolmaster is and always must be essentially an ass, for how can one imagine an intelligent man engaging in so puerile an avocation.

To the best of my knowledge and belief, the average American newspaper, even of the so-called better sort, is not only quite as bad as Upton Sinclair says it is, but 10 times worse

The only way to reconcile science and religion is to set up something which is not science and something that is not religion.

Socialist: A man suffering from an overwhelming conviction to believe what is not true.