A little doubt is better than total credulity.

They all err - Muslims, Christians, Jews and Magians. There are two kinds of humans - the intelligent, who have no religion, and the religious, who have no intellect.

They recite their sacred books, although the fact informs me that these are a fiction from first to last. O Reason, thou (alone) speakest the truth. Then perish the fools who forged the (religious) traditions or interpreted them!

The inhabitants of the earth are of two sorts: Those with brains, but no religion, And those with religion, but no brains.

A little doubt is better than total credulity.

The world holds two classes of men; intelligent men without religion, and religious men without intelligence.

Give a drink of water as alms to the birds which go forth at morning, and deem that they have a better right than men [to thy charity]. For their race brings not harm upon thee in any wise, when thou fearest it from thine own race.