The difference between the sensual and the spiritual is in some cases most evident; in others it is most subtle. There are men who never have an idea beyond the lowest self-gratification; they live for it; they boast of it. We need not analyse the moral peculiarities of such men. There are others, however, whose sensuality, though more refined, is not less potent in impairing the finest capacities and tendencies of the soul. Who are they? (1) Men who live entirely within the sphere of the visible; (2) men who look at actions without inquiring into motives; (3) men who look at their own profits, not at the benefit of the commonwealth; (4) men to whom the social is more than the spiritual; (5) men to whom the present is more than the future. Who are the spiritual? There is a noble sense in which the poet is spiritual; so is the musician; so is the painter. Such men translate ideas into language, into sound, into form. There is, however, an infinitely nobler sense in which the term "spiritual" is used: the sense which involves the presence and dominion of the Holy Ghost in the soul of man. The Holy Ghost can be received only through the work of Jesus Christ.
Parker, City Temple,vol. i., p. 61.
Reference: Jude 1:19. Spurgeon, Sermons,vol. iv., No. 167.