People tend to measure themselves by external accomplishments, but jail allows a person to focus on internal ones; such as honesty, sincerity, simplicity, humility, generosity and an absence of variety. You learn to look into yourself.
I would not have every man nor every part of a man cultivated, any more than I would have every acre of earth cultivated: part will be tillage, but the greater part will be meadow and forest, not only serving an immediate use, but preparing a mould against a distant future, by the annual decay of the vegetation which it supports.