All prayers die in the air which they uselessly agitate.

Intelligence is the only moral guide.

Surely there is grandeur in knowing that in the realm of thought, at least, you are without a chain; that you have the right to explore all heights and depth; that there are no walls nor fences, nor prohibited places, nor sacred corners in all the vast expanse of thought.

When a fact can be demonstrated, force is unnecessary; when it cannot be demonstrated, force is infamous.

Fear is religion, courage is science.

Some president wishes to be re-elected, and thereupon speaks about the Bible as "the corner-stone of American Liberty." This sentence is a mouth large enough to swallow any church, and from that time forward the religious people will be citing that remark of the politician to substantiate the inspiration of the Scriptures.

One good schoolmaster is worth a thousand priests.