“Where there is most feeling, there is the greatest martyrdom.”
The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
Variant: Where there is most power of feeling, there of martyrs is the greatest martyr.
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Leonardo Da Vinci 363
Italian Renaissance polymath 1452–1519Related quotes

Source: Zen and the Art of Motorcycle Maintenance (1974), Ch. 29
Context: It's paradoxical that where people are the most closely crowded, in the big coastal cities in the East and West, the loneliness is the greatest. Back where people were so spread out in western Oregon and Idaho and Montana and the Dakotas you'd think the loneliness would have been greater, but we didn't see it so much.
The explanation, I suppose, is that the physical distance between people has nothing to do with loneliness. It's psychic distance, and in Montana and Idaho the physical distances are big but the psychic distances between people are small, and here it's reversed.

“People leave traces of themselves where they feel most comfortable, most worthwhile.”
Source: Dance Dance Dance

The Autocrat of the Breakfast Table (1858)

Source: Unpopular Essays
http://www.survivalblog.com/2006/10/the_memsahibs_quote_of_the_day_4.html
How to Survive the End of the World as We Know It, Plume, New York (2009)

“Sometimes the greatest things are the most embarrassing.”
Source: Seriously... I'm Kidding

“Greatest fools are oft most satisfied.”
Le plus fou souvent est le plus satisfait.
Satire 4, l. 128
Satires (1716)