A lot of 11 bumper stickers featuring quotes from Henry David Thoreau. Included are:

... all good things are wild and free

Be not simply good; be good for something.

A government which deliberately enacts injustice, and persists in it, will at length become the laughing-stock of the world.

I say, beware of all enterprises that require new clothes.

In Wildness is the preservation of the world.

Nothing is so much to be feared as fear.

Only that day dawns to which we are awake. There is more day to dawn.

Simplify, simplify.

A very few, as heroes, patriots, martyrs, reformers in the great sense, and men, serve the State with their consciences ...

What is the use of a house if you haven't got a tolerable planet to put it on?