Now a word of warning about the criteria of esthetic judgment. A sense of life is the source of art, but it is not the sole qualification of an artist or of an esthetician, and it is not a criterion of esthetic judgment. Emotions are not tools of cognition. Esthetics is a branch of philosophy — and just as a philosopher does not approach any other branch of his science with his feelings or emotions as his criterion of judgment, so he cannot do it in the field of esthetics. A sense of life is not sufficient professional equipment. An esthetician — as well as any man who attempts to evaluate art works — must be guided by more than an emotion.The fact that one agrees or disagrees with an artist’s philosophy is irrelevant to an esthetic appraisal of his work qua art. One does not have to agree with an artist (nor even to enjoy him) in order to evaluate his work. In essence, an objective evaluation requires that one identify the artist’s theme, the abstract meaning of his work (exclusively by identifying the evidence contained in the work and allowing no other, outside considerations), then evaluate the means by which he conveys it — i.e., taking his theme as criterion, evaluate the purely esthetic elements of the work, the technical mastery (or lack of it) with which he projects (or fails to project) his view of life . . . .Since art is a philosophical composite, it is not a contradiction to say: “This is a great work of art, but I don’t like it,” provided one defines the exact meaning of that statement: the first part refers to a purely esthetic appraisal, the second to a deeper philosophical level which includes more than esthetic values.