One travels more usefully when alone, because he reflects more.

When a man assumes a public trust he should consider himself a public property.

He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors.

It is error alone which needs the support of government. Truth can stand by itself.

I was bold in the pursuit of knowledge, never fearing to follow truth and reason to whatever results they led, and bearding every authority which stood in their way.