This passage of the book I am reading right now made me think and I like it more as more as I read and understand it. Here it is:

BODY AND MIND

Whatever increases, decreases, limits or extends the body's power of action, increases decreases, limits or extends the mind's power of action. And whatever increases, decreases limits, or extends the mind's power of action, also increases, decreases, limits, or extends the body's power of action.

 -Spinoza (1632-1677)-