Permaculture principles

Diversity isn't involved so much with the number of elements in a system as it is with the number of functional connections between these elements. Diversity is not the number of things, but the number of ways in which things work.
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Our ability to change the face of the Earth increases at a faster rate than our ability to forsee the consequences of that change.
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We should not confuse order with tidiness. Tidiness is something that happens when you have frontal brain damage. You get very tidy. Tidiness is symptomatic of brain damage. Creativity, on the other hand, is symptomatic of a fairly whole brain, and is usually a disordered affair. The tolerance for disorder is one of the very few healthy signs in life. If you can tolerate disorder, you are probably healthy. Creativity is seldom tidy.

[source: Bill Mollison - An Introduction To Permaculture]