And the cost of a thing, it will be remembered, is the amount of life it requires to be exchanged for it.
After December 6, 1845 - Journals (1838-1859). A similar quote is also found in his work Walden (1854): "and the cost of a thing is the amount of what I will call life which is required to be exchanged for it"
See also: The price of anything is the...