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The essence of optimism is that it takes no account of the present, but it is a source of inspiration, of vitality and hope where others have resigned; it enables a man to hold his head high, to claim the future for himself and not to abandon it to his enemy.

Pessimism leads to weakness, optimism to power.

It is the hopeful, buoyant, cheerful attitude of mind that wins. Optimism is a success builder; pessimism an achievement killer.

My pessimism goes to the point of suspecting the sincerity of the pessimists.

There's probably a little greater case for pessimism than optimism. But I do not rule out optimism.

Pessimism, when you get used to it, is just as agreeable as optimism.

One has to have the courage of one's pessimism.

I am not a pessimist; to perceive evil where it exists is, in my opinion, a form of optimism.

Optimism means better than reality; pessimism means worse than reality. I'm a realist.

I think optimism springs from nature. I'm a gardener. Nature has taught me about rhythm, the essence of every art. With so much that is terrible, nature gives me pleasure.