He demands too much from others.

The inarticulate son had set up a standard for himself with that need for embodying in his conduct the dreams, the passion, the impulses the poet puts into arrangements of verses, which are dearer to him than his own self--and may make his own self appear sublime in the eyes of other people, and even in his own eyes.
Did Anthony wish to appear sublime in his own eyes?
I should not like to make that charge; though indeed there are other, less noble, ambitions at which the world does not dare to smile.

But I don't think so; I do not even think that there was in what he did a conscious and lofty confidence in himself, a particularly pronounced sense of power which leads men so often into impossible or equivocal situations.

Looked at abstractedly (the way in which truth is often seen in its real shape) his life had been a life of solitude and silence--and desire.
Chance had thrown that girl in his way; and if we may smile at his violent conquest of Flora de Barral we must admit also that this eager appropriation was truly the act of a man of solitude and desire; a man also, who, unless a complete imbecile, must have been a man of long and ardent reveries wherein the faculty of sincere passion matures slowly in the unexplored recesses of the heart.

And I know also that a passion, dominating or tyrannical, invading the whole man and subjugating all his faculties to its own unique end, may conduct him whom it spurs and drives, into all sorts of adventures, to the brink of unfathomable dangers, to the limits of folly, and madness, and death.
To the man then of a silence made only more impressive by the inarticulate thunders and mutters of the great seas, an utter stranger to the clatter of tongues, there comes the muscular little Fyne, the most marked representative of that mankind whose voice is so strange to him, the husband of his sister, a personality standing out from the misty and remote multitude.