Life is for action, and if we desire to know anything, we must make up our minds to be ignorant about much.

If men are discharged of reverence for ancient usage, they will treat this world, almost certainly, as if it were their private property, to be consumed for their sensual gratification; and thus they will destroy in their lust for enjoyment the property of future generations, of their own contemporaries, and indeed their very own capital.

Nothing is more conservative than conservation

A society which denies the heart its role becomes, in very short order, a heartless society.

The issue of environmental quality is one which transcends traditional political boundaries. It is a cause which can attract, and very sincerely, liberals, conservatives, radicals, reactionaries, freaks, and middle-class straights.

Not by force of arms are civilizations held together, but by subtle threads of moral and intellectual principle.

...so mankind is now trapped by the failure of its energies and by the depletion of those natural resources that men have plundered wantonly.