Quote:
Originally Posted by d4rk3lf
If I (simple human) understand that, how come that Sauron (from angelic nature) didn't get it?
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Because Tolkien is expressing the existence of absolute evil.
Evil that self-deludes to the point where it utterly believes the lies it tells of itself to others.
Thus Melkor came to believe he could indeed defy Eru and the might of the combined Ainur. Further even when it was clear to him, in the beginning, that Illuvatar's power was inviolate, he still chose Lucifer's option: Better to rule in Hell, than serve in Heaven.
Sauron was simply following that lead. He was utterly corrupted, and clearly believed that he could indeed be victorious.