Ibsen's development has always lain chiefly in the perfecting of his tools. From the beginning he has had certain ideas, certain tendencies, a certain consciousness of things to express; he has been haunted, as only creative artists are haunted, by a world waiting to be born; and, from the beginning, he has built on a basis of criticism, a criticism of life. Part of his strength has gone out in fighting: he has had the sense of a mission. Part of his strength has gone out in the attempt to fly: he has had the impulse, without the wings, of the poet. And when he has been content to leave fighting and flying alone, and to build solidly on a solid foundation, it is then that he has achieved his great work. But he has never been satisfied, or never been able, to go on doing just that work, his own work; and the poet in him, the impotent poet who is full of a sense of what poetry is, but is never able, for more than a moment, to create poetry, has come whispering in the ear of the man of science, who is the new, unerring artist, the maker of a wonderful new art of prose, and has made him uneasy, and given uncertainty to his hand. The master-builder has altered his design, he has set up a tower here, 'too high for a dwelling-house,' and added a window there, with the stained glass of a church window, and fastened on ornaments in stucco, breaking the severe line of the original design. In Ibsen science has made its great stand against poetry; and the Germans have come worshipping, saying, 'Here, in our era of marvellously realistic politics, we have come upon correspondingly realistic poetry.... We received from it the first idea of a possible new poetic world.... We were adherents of this new school of realistic art: we had found our aesthetic creed.' But the maker of this creed, the creator of this school of realistic art, was not able to be content with what he had done, though this was the greatest thing he was able to do. It is with true insight that he boasts, in one of his letters, of what he can do 'if I am only careful to do what I am quite capable of, namely, combine this relentlessness of mind with deliberateness in the choice of means.' There lay his success: deliberateness in the choice of means for the doing of a given thing, the thing for which his best energies best fitted him. Yet it took him forty years to discover exactly what those means to that end were; and then the experimenting impulse, the sense of what poetry is, was soon to begin its disintegrating work. Science, which seemed to have conquered poetry, was to pay homage to poetry.