Men govern nothing with more difficulty than their tongues, and can moderate their desires more than their words.
Baruch SpinozaWhatever 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.
Baruch Spinoza