I have no argument why I'm interested in maths. There's a fascination that I cannot explain. People ask me why I stack shelves? I say it's because I'm a mathematician.
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Wittgenstein tells us that: "If a thing can be said, it can be said clearly".
Maybe you could try it.
What do you stack on shelve? What does that have to do with being a mathematician? Do you earn your living doing or teaching mathematics?
Looked at your other 8 posts...all sort of unclear (to me, anyway);
what's your purpose?