I happen to have discovered a direct relation between magnetism and light, also electricity and light, and the field it opens is so large and I think rich.

The world little knows how many of the thoughts and theories which have passed through the mind of a scientific investigator, have been crushed in silence and secrecy by his own severe criticism and adverse examination!

Speculations? I have none. I am resting on certainties.

A man who is certain he is right is almost sure to be wrong.

Who would not have been laughed at if he had said in 1800 that metals could be extracted from their ores by electricity or that portraits could be drawn by chemistry.

I will simply express my strong belief, that that point of self-education which consists in teaching the mind to resist its desires and inclinations, until they are proved to be right, is the most important of all, not only in things of natural philosophy, but in every department of dally life.

The lecturer should give the audience full reason to believe that all his powers have been exerted for their pleasure and instruction.