Simplicity.

Simplicity, simplicity, simplicity! I say, let your affairs be as two or three, and not a hundred or a thousand instead of a million count half a dozen, and keep your accounts on your thumb-nail. As you simplify your life, the laws of the universe will be simpler; solitude will not be solitude, poverty will not be poverty, nor weakness weakness.. Most of the luxuries, and many of the so-called comforts of life, are not only not indispensable, but positive hindrances to the elevation of mankind. With respect to luxuries and comforts, the wisest have even lived a more simple and meagre life than the poor.

- Henry David Thoreau