The aim of science is, on the one hand, a comprehension, as complete as possible, of the connection between the sense experiences in their totality, and, on the other hand, the accomplishment of this aim by the use of a minimum of primary concepts and relations. (Seeking as far as possible, logical unity in the world picture, i.e., paucity in logical elements.)
— Einstein, "Physics and Reality", 1936, reprinted in Einstein, Ideas and Opinions, 1954.