In the "Philosophy of Freedom", Steiner further explores potentials within thinking: freedom, he suggests, can only be approached gradually with the aid of the creative activity of thinking. Thinking can be a free deed; in addition, it can liberate our will from its subservience to our instincts and drives. Free deeds, he suggests, are those for which we are fully conscious of the motive for our action; freedom is the spiritual activity of penetrating with consciousness our own nature and that of the world, and the real activity of acting in full consciousness. This includes overcoming influences of both heredity and environment: "To be free is to be capable of thinking one's own thoughts – not the thoughts merely of the body, or of society, but thoughts generated by one's deepest, most original, most essential and spiritual self, one's individuality."