„The soul refuses limits, and always affirms an Optimism, never a Pessimism.“

— Ralph Waldo Emerson

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„Pessimism of the intellect, optimism of the will.“
— Antonio Gramsci
„To think in terms of either pessimism or optimism oversimplifies the truth. The problem is to see reality as it is.“
— Thich Nhat Hanh
„The test of all beliefs is their practical effect in life. If it be true that optimism compels the world forward, and pessimism retards it, then it is dangerous to propagate a pessimistic philosophy.“
— Helen Keller
„Belief consists in accepting the affirmations of the soul; unbelief, in denying them.“
— Ralph Waldo Emerson
„I find the audiences very excited. But then they come and say to me, "Your optimism has brushed off on me. I didn't know we had an option. I feel so much better." They say, "Your optimism." And I am not optimistic or pessimistic. I feel that optimism and pessimism are very unbalanced. I am a very hard engineer.“
— Buckminster Fuller