"The moving toward one's inner self is a long pilgrimage for a painter. It offers many temporary successes and high points, but impels him on toward the more adequate image."

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One advantage of exhibiting a hierarchy of systems in this way is that it gives us some idea of the present gaps in both theoretical and empirical knowledge. Adequate theoretical models extend up to about the fourth level, and not much beyond. Empirical knowledge is deficient at practically all levels.

— Kenneth E. Boulding