The only census of the senses, so far as I am aware, that ever before made them more than five, was the Irishman's reckoning of seven senses. I presume the Irishman's seventh sense was common sense; and I believe that the possession of that virtue by my countrymen-I speak as an Irishman.

I have not had a moment's peace or happiness in respect to electromagnetic theory since November 28, 1846. All this time I have been liable to fits of ether dipsomania, kept away at intervals only by rigorous abstention from thought on the subject.

In science there is only physics; all the rest is stamp collecting.

[Of the ether] it is no greater mystery at all events than the shoemakers' wax.

The vortex theory [of the atom] is only a dream. Itself unproven, it can prove nothing, and any speculations founded upon it are mere dreams about dreams.

If you study science deep enough and long enough, it will force you to believe in God.

There is nothing new to be discovered in physics now. All that remains is more and more precise measurement.