Adaptation is the transformation of an organism by incorporating the environment into its extended cognitive system.

Adaptation is the desire to control environment.

Adaptation is inherent in man. There are no conditions to which a person cannot grow accustomed, especially if he sees that everyone around him lives in the same way.

Adaptation is a necessary faculty of that scoundrel, man. He can grow used to everything.

Caution is fear on tiptoe.

Caution is wise — A cautious man is worth two.

Caution is not likely to lead to success — A castle is not overthrown by precaution.

Caution is the parent of safety.

Distance is the soul of beauty.

Distance is the only cure for certain diseases.

Distance is nothing to the lover — Who travels for love finds a thousand miles not longer than one.

Distance is, in modernity, short in terms of length and yet ever remote to us. What is vastly far away in terms of length, can be near to us. Short distance is not already nearness. Great distance is not yet remoteness.

Doubt is the abettor of tyranny.

Doubt is important to knowledge — He knows not how to know who knows not also how to unknow.

Doubt is important to faith — A faith which does not doubt is a dead faith.

Doubt is healthy — Human beings are perhaps never more frightening than when they are convinced beyond doubt that they are right.