Others indeed may talk, and write, and fight about liberty, and make an outward pretence to it but the free-thinker alone is truly free.

To be is to be perceived (Esse est percipi)." Or, "If a tree falls in the forest and no one is there to hear it, does it make a sound?

Truth is the cry of all, but the game of few.

All the choir of heaven and furniture of earth - in a word, all those bodies which compose the frame of the world - have not any subsistence without a mind.

The same principles which at first view lead to skepticism, pursued to a certain point, bring men back to common sense.

Many things, for aught I know, may exist, whereof neither I nor any other man hath or can have any idea or notion whatsoever.