I just been contemplating how a subtle discontent is actually a motivating force for action. And another motivator is curiousity.
And in the Letter to Menoeceus (as Don pointed out) that the sweet life is brought forth by self-controlled reasoning...as it says in the letter:
"searching out the motives for all choice and avoidance"
So these two things motivate action:
- discontent (physical pain or mental discontent/subtle fear)
- curiousity (wanting to try out a physical sensation or learn something)
Any others?