Rousseau Jean-Jacques 1712-1778

The body should be strong enough to obey the mind; a good servant must be strong. I know that intemperance stimulates the passions; in course of time it also destroys the body; fasting and penance often produce the same results in an opposite way. The weaker the body, the more imperious its demands; the stronger it is, the better it obeys. All sensual passions find their home in effeminate bodies; the less satisfaction they can get the keener their sting.

gratitude is a duty which ought to be paid but which none have a right to expect

I can only meditate when I am walking, when I stop I cease to think; my mind only works with my legs.