Which preposition to use with egoist

in Occurrences 1%

Now, I would not seem so paradoxical as to say that when an extravaganza is held up to me in one hand, and a masterpiece of morality like The Egoist in the other, I can doubt which is the greater book; but there are moods in which I am jealous of the novels, and wish to be left alone with my Arabian Entertainment.

to Occurrences 1%

He was an egoist to his finger-tips that night.

Which preposition to use with  egoist