In completing one discovery we never fail to get an imperfect knowledge of others.

I have procured air [oxygen] ... between five and six times as good as the best common air that I have ever met with.

Orthodoxy, my Lord,: said Bishop Warburton, in a whisper, — orthodoxy is my doxy, — heterodoxy is another man's doxy.

Will is nothing more than a particular case of the general doctrine of association of ideas, and therefore a perfectly mechanical thing.

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.

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.

To me there is in happiness an element of self-forgetfulness. You lose yourself in something outside yourself when you are happy; just as when you are desperately miserable you are intensely conscious of yourself, are a solid little lump of ego weighing a ton.