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

The more elaborate our means of our common sense is, the less the common sense it becomes.

This is unfortunately a world in which things find it difficult, frequently impossible, to live up to their names.

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

It is no use speaking in soft, gentle tones if everyone else is shouting.

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.

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