"The imagination is the medium of appreciation in every field. The engagement of the imagination is the only thing that makes any activity more than mechanical. Unfortunately, it is too customary to identify the imaginative with the imaginary, rather than with a warm and intimate taking in of the full scope of a situation."

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Incapacity to appreciate certain types of beauty may be the condition sine qua non for the appreciation of another kind; the greatest capacity both for enjoyment and creation is highly specialized and exclusive, and hence the greatest ages of art have often been strangely intolerant. The invectives of one school against another, perverse as they are philosophically, are artistically often signs of health, because they indicate a vital appreciation of certain kinds of beauty, a love of them that has grown into a jealous passion.

— George Santayana