The power of the mind (usually) == body strength, the strength of the body leads to the practice of the case, which leads to the power of the mind - Recursion! A little further strength to the mind:
Formal education will help you survive. Self-education will make you a fortune
Practice makes perfect.
We are what we do constantly. Excellence, therefore, is not an act, but a habit.
Iron rusts, not finding a use, stagnant water rots, or freezing cold, and the human mind, not finding a use, wasting away.
Read it to not for, to contradicting and refuting, not in order to take on faith; and do not then to find a subject for conversation; but to think and reason.
Having reached the end of what you should know, you find yourself at the beginning of what should be felt.
By the way, I notice that this quote perfectly convergent with the "lake of knowledge within man" of Castaneda.
In us, it flourishes what we cherish. This is the eternal law of nature.
Be who we are and to become what we are capable of becoming, is the only purpose of life.
Tell me - and I will forget, show me - and maybe I'll remember, involve me - and then I comprehend.
Life in fact is darkness when there is no aspiration. Any attempts is blind when there is no knowledge. All knowledge in vain where there is no labor. Any work is fruitless when there is no love (to the point, for example.)