"To have done anything by which you earned money merely," says Thoreau, "is to be" (have been, he means) "idle and worse." There are two passages in his letters, both, oddly enough, relating to firewood, which must be brought together to be rightly understood. So taken, they contain between them the marrow of all good sense on the subject of work in its relation to something broader than mere livelihood. Here is the first: "I suppose I have burned up a good-sized tree to-night--and for what? I settled with Mr. Tarbell for it the other day; but that wasn't the final settlement. I got off cheaply from him. At last one will say: 'Let us see, how much wood did you burn, sir?' And I shall shudder to think that the next question will be, 'What did you do while you were warm?'" Even after we have settled with Admetus in the person of Mr. Tarbell, there comes, you see, a further question. It is not enough to have earned our livelihood. Either the earning itself should have been serviceable to mankind, or something else must follow. To live is sometimes very difficult, but it is never meritorious in itself; and we must have a reason to allege to our own conscience why we should continue to exist upon this crowded earth. If Thoreau had simply dwelt in his house at Walden, a lover of trees, birds, and fishes, and the open air and virtue, a reader of wise books, an idle, selfish self-improver, he would have managed to cheat Admetus, but, to cling to metaphor, the devil would have had him in the end. Those who can avoid toil altogether and dwell in the Arcadia of private means, and even those who can, by abstinence, reduce the necessary amount of it to some six weeks a year, having the more liberty, have only the higher moral obligation to be up and doing in the interest of man.