Reserve your right to think, for even to think wrongly is better than not to think at all.

Could we have entered into the mind of Sir Isaac Newton, and have traced all the steps by which he produced his great works, we might see nothing very extraordinary in the process.

The more elaborate our means of communication, the less we communicate.

In completing one discovery we never fail to get an imperfect knowledge of others of which we could have no idea before, so that we cannot solve one doubt without creating several new ones.

What I have known with respect to myself, has tended much to lessen both my admiration, and my contempt, of others.