The more efficient causes of progress seem to consist of a good education during youth whilst the brain is impressible, and of a high standard of excellence, inculcated by the ablest and best men, embodied in the laws, customs and traditions of the nation, and enforced by public opinion.

The instruction at Edinburgh was altogether by lectures, and these were intolerably dull, with the exception of those on chemistry.

I agree with Agassiz that dogs possess something very like conscience.

The moral faculties are generally and justly esteemed as of higher value than the intellectual powers.

I can remember the very spot in the road, whilst in my carriage, when to my joy the solution occurred to me.

... probably all the organic beings which have ever lived on this earth have descended from some one primordial form, into which life was first breathed.

I have at least, as I hope, done good service in aiding to overthrow the dogma of separate creations.