“A human being, in order to function fully and effectively in this world, needs to develop in himself all four of these tools of maturity: 1) physical energy and bodily self-control; 2) emotional calmness and expansive feeling; 3) dynamic, persistent will power; and 4) a clear-sighted, practical intellect. Remove any one of these aspects from the equation and the equation itself becomes distorted. Each aspect depends for its perfection on the other three....These tools are best developed in sequence: bodily awareness first, then sensitivity of feeling, then will power, and last of all, intellect.”