All are sure in their days except the most wise ... He is the wisest philosopher who holds his theory with some doubt.

It is right that we should stand by and act on our principles; but not right to hold them in obstinate blindness, or retain them when proved to be erroneous.

I could trust a fact and always cross-question an assertion.

I am no poet, but if you think for yourselves, as I proceed, the facts will form a poem in your minds.

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.

All your names I and my friend approve of or nearly all as to sense & expression, but I am frightened by their length & sound when compounded. As you will see I have taken deoxide and skaiode because they agree best with my natural standard East and West. I like Anode & Cathode better as to sound, but all to whom I have shewn them have supposed at first that by Anode I meant No way.

I cannot conceive curved lines of force without the conditions of a physical existence in that intermediate space.