The liberty of man consists solely in this: that he obeys natural laws because he has himself recognized them as such, and not because they have been externally imposed upon him by any extrinsic will whatever, divine or human, collective or individual.
Bio: Susan Sutherland Isaacs, CBE was a Lancashire-born educational psychologist and psychoanalyst. She published studies on the intellectual and social development of children and promoted the nursery school movement.