Long story short, it's part of the way I love God. I think the most important way to love God is to constantly strive to be a better person, but that's pretty abstract. There were some very concrete, very easy ways to worship God laid out in the beginning of the Bible that my goal-oriented brain can handle a little easier than the open-ended "be better".
There also the self-negation. In that I mean giving up something I would otherwise enjoy as a form of worship. Same idea as fasting, celibacy, and charity in a way.
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