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human
Why was Nietzsche "life-affirming"?

I've been trying to study Nietzsche a bit and I'm beginning to grasp some of his ideas. "Life-affirmation" seems to be kind of an axiom for him, so basically I'm wondering what is Nietzsche's reason for being life affirming? Why be life-affirming?
gpt
Nietzsche had a really sparkling personality, he grew up as a really dynamic boy with a lively mind that characterise his writings. Having also a brilliant and sharp eye, it's obvious that in a century such the century of romanticism he would've detected the rotten parts of it, which contrasted with his vernal character: all the heaviness, theatricality, tiredness, idealism of romanticism enlightened Nietzsche in such way that he, firstly, started question the whole hisotry of philosophy in such perspective and, after and deeper, the whole history of Europe under the influence of Christianity.
According to him and his "genealogical" analysis, Europe has been corrupted firstly by a rotten philosophical tradition that points towards a life-denying metaphysics, and secondly by the even more explicitly life-denying history of Christianity.
He stressed the importance of contrasting these degenerate ideologies, because of many reasons (which you'd probably find clearly in "Genealogy of Morals" and "Twilight of the Idols"), probably the main one being that life is will to power so no matter what life has to empower itself and that's where a man should point to.