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.

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.

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

Nature is our kindest friend and best critic in experimental science if we only allow her intimations to fall unbiased on our minds.

When I consider the multitude of associated forces which are diffused through nature - when I think of that calm balancing of their energies which enables those most powerful in themselves, most destructive to the world's creatures and economy, to dwell associated together and be made subservient to the wants of creation, I rise from the contemplation more than ever impressed with the wisdom, the beneficence, and grandeur, beyond our language to express, of the Great Disposer of us all.

Lectures which really teach will never be popular; lectures which are popular will never really teach.

Nothing is ever too good to be true.