The self is made up, on its growing edge, of the models, forms, metaphors, myths, and all other kinds of psychic content which give it direction in its self-creation. This is a process that goes on continuously. As Kierkegaard well said, the self is only that which it is in the process of becoming. Despite the obvious determinism in human life — especially in the physical aspect of ones self in such simple things as color of eyes, height relative length of life, and so on — there is also, clearly, this element of self-directing, self-forming. Thinking and self-creating are inseparable. When we become aware of all the fantasies in which we see ourselves in the future, pilot ourselves this way or that, this becomes obvious.

Ch. 5 : The Delphic Oracle as Therapist, p. 99 - The Courage to Create (1975)