The concept of advancing society through the combined agencies of evolution and revo? lution was at one time related in a single over? arching theory. The opposition of evolution and revolution, on the contrary, stands to us not as a dialectical relation whose contradictions are to be resolved, but as an unresolved tension. Let us take first the concept of the evolution of society, expressed as the cumulation of vast numbers of unconscious adaptations and con? scious adjustments, as the slow growth of man? kind. The theory underlying social evolution is doubly linked to biology. It points back in time to the biological and biochemical matrix out of which humanity emerged through the action of inherent forces, forces which are out? side human control, and it points forward to the future mastery by human beings over then biology and society. Social progress in this sense is nonviolent and gradual, a growth cycle of long duration, ultimately leading to the maturation and realization of processes lying immanent within us. These processes are not dormant, for that would imply that the giant is full grown but asleep; the giant that we are to become is not yet full size, but the poten? tiality of growing to be that giant is our final end, our entelechy, the inherent finality. Humanity is the realization of the inborn potential of animal matter. The movement of the biological organism toward humanity is irreversible; it is a movement with but one direction. We are not the humanity that we can become. We hold ourselves to be human beings, and we are indeed partly human, partly socialized. The theory of evolution, further