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Your most unhappy customers are your greatest source of learning.

The more you know, the more you can know.

The transformation of the coal industry requires both determination and patience.

We have so far to go to realize our human potential for compassion, altruism, and love.

The only freedom which deserves the name is that of pursuing our own good in our own way， so long as we do not attempt to deprive others of theirs， or impede their efforts to obtain it.

Every piece of plastic ever made still exists somewhere on this planet—that's both our challenge and our responsibility.