Having read your post, I would say that the biggest challenge to our willpower is learning to say no to ourselves.
I can say no to someone else without thinking about it. But, when it comes to one's self, we find it so hard to resist our weaknesses and temptations.
Believe me, I know. But ultimately, I when I think about the consequences of my weakness, then I am motivated to resist the urge to indulge myself.
Cheers

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