Philosophy is a kind of journey, ever learning yet never arriving at the ideal perfection of truth."

Doubt [is] the essential preliminary of all improvement and discovery. The faculty of doubting and questioning . . . is itself a divine prerogative of the reason.

Faith begins where Reason sinks exhausted.

"To work with the hands or brain, according to our requirements and our capacities, to do that which lies before us to do, is more honorable than rank and title."

The eyes of the cheerful and of the melancholy man are fixed upon the same creation; but very different are the aspects which it bears to them.