He who will not reason is a bigot; he who cannot is a fool; and he who dares not is a slave. – William Drummond, Academical Questions

The thoughts that come often unsought, and, as it were, drop into the mind, are commonly the most valuable of any we have. – John Locke, 16 May 1699

…the thoughtful excitement of lonely rambles, of gardening, and of other like occupations, where the mind has leisure to must during the healthful activity of the body, with the fresh and wakeful breezes blowing round it… – Augustus William Hare and Julius Charles Hare, Guesses at Truth, by Two Brothers