"A theory is a good theory if it satisfies two requirements: it must accurately describe a large class of observations on the basis of a model that contains only a few arbitrary elements, and it must make definite predictions about the results of future observations."

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He refused categorically all ideas of fidelity or serious commitments. He explained that they were arbitrary and sterile. From anyone else such views would have shocked me, but I knew that in his case they did not exclude tenderness and devotion - feelings which came all the more easily to him since he was determined that they should be transient.

— Francoise Sagan