This subterranean fire has its altar in each man’s breast, for in the coldest day, and on the bleakest hill, the traveller cherishes a warmer fire within the folds of his cloak than is kindled on any hearth. A healthy man, indeed, is the complement of the seasons.

Henry D. Thoreau

Thoreau, Henry D.. Essays: A Fully Annotated Edition. Italy, Yale University Press, 2013.