It seems to me that a man will best gain command over those intellectual faculties which he knows are his strongest, by cultivating the faculties that somewhat tend to counterbalance them. He in whom imagination is opulent and fervid will regulate and discipline its exercise by forcing himself to occupations or studies that require plain common sense. He who feels that the bias of his judgment or the tendency of his avocations is over-much towards the positive and anti-poetic forms of life, will best guard against the narrowness of scope and feebleness of grasp which characterise the intellect that seeks common sense only in commonplace, by warming his faculties in the glow of imaginative genius; he should not forget that where heat enters it expands. And, indeed, the rule I thus lay down, eminent men have discovered for themselves. Men of really great imagination will be found to have generally cultivated some branch of knowledge that requires critical or severe reasoning. Men of really great capacities for practical business will generally be found to indulge in a predilection for works of fancy. The favourite reading of poets or fictionists of high order will seldom be poetry or fiction. Poetry or fiction is to them a study, not a relaxation. Their favourite reading will be generally in works called abstruse or dry—antiquities, metaphysics, subtle problems of criticism, or delicate niceties of scholarship. On the other hand, the favourite reading of celebrated lawyers is generally novels. Thus in every mind of large powers there is an unconscious struggle perpetually going on to preserve its equilibrium. The eye soon loses its justness of vision if always directed towards one object at the same distance—the soil soon exhausts its produce if you draw from it but one crop. But it is not enough to secure counteraction for the mind in all which directs its prevailing faculties towards partial and special results; it is necessary also to acquire the power to keep differing faculties and acquirements apart and distinct on all occasions in which it would be improper to blend them. When the poet enters on the stage of real life as a practical man of business, he must be able to leave his poetry behind him; when the practical man of business enters into the domain of poetry, he must not remind us that he is an authority on the Stock Exchange. In a word, he who has real self-control has all his powers at his command, now to unite and now to separate them.