By taste, after he has exercised and corrected it by manifold examples from art or nature, the artist checks his work; and after many, often toilsome, attempts to content taste he finds the form which satisfies him. Hence this form is not, as it were, a thing of inspiration or the result of a free swing of the mental powers, but of a slow and even painful process of improvement, by which he seeks to render it adequate to his thought, without detriment to the freedom of the play of his powers.