Just a quick note today:
You know how your muscles grow if you lift heavy weights? They wouldn't grow if they didn't need to. They only do it if there's a reason to, and the reason is that they're subjected to a load.
They have no choice but to grow and adapt, so that's what they'll do.
Similarly, your will is a muscle that only grows if you subject it to a load, although the load here isn't a physical dumbbell, but a metaphysical load: an opposing force.
Something feels hard or difficult = opposing force. At first, your will muscle screams that it can't handle it. But once you continue to subject the will muscle to the hard thing, the easier it becomes, until it's no pain at all.
At which point you move on to heavier weights - I mean, more difficult things.
If you stop subjecting your will to difficult challenges, the muscle will atrophy.
Just like any other muscle.
(I know this is all obvious; I just needed to remind myself.)
(RK out.)