Meanings of become an egotist in English

He had become an egotist and so had dared to love her.

I am become an egotist to-night, for self is the only theme of which I can discourse.

Fame appears insipid at my twenty-nine years; I have tried every thing; nothing remains but to become an egotist." [Footnote: "Memoires du Roi Joseph." vol.

With all his wisdom and early piety, he became an egotist, a sensualist, and a tyrant.

And, if a writer dwells upon that solely or principally, is he not in danger of repeating himself, and also of becoming an egotist?