Where does personal energy come from?

You know that feeling when you have to do something you don’t want to do?  You don’t have a lot of unconscious voluntary energy for it.  But when you are doing something you want to do, you have boundless energy.  Where does that energy come from?

Here’s my take after studying this for a long time – it comes from motivation.  If I am motivated to do a thing, I have energy for it.

Where does “motivation” come from?  We’ll talk about that tomorrow…