It may, however, be retrogressive; and it is sure to repay flippant neglect by lending its empty space to mean delusions. To its great problems _some_ answer will always be attempted; and there is much to choose between the solutions, however imperfect, found by reverential wisdom, and the degrading falsehoods tendered in reply by the indifferent and superficial. Even in their failures, there is a vast difference between the explorings of the seeing and the blind. We deny, however, that Christian theology can assume any aspect of failure, except to those who use a false measure of success. It is not in the nature of religion, of poetry, of art, to exhibit the kind of progress that belongs to physical science. They differ from it in seeking, not the _phenomena_ of the universe, but its _essence_,--not its laws of change, but its eternal meanings,--not outward nature, in short, except as expressive of the inner thought of God; and being thus intent upon the enduring spirit and very ground of things, they cannot grow by numerical accretion of facts and exacter registration of successions. They are the product, not of the patient sense and comparing intelligence which are always at hand, but of a deeper and finer insight, changing with the atmosphere of the affections and will. Instead of looking, therefore, for perpetual advance of discovery in theology, we should naturally expect an ebb and flow of light, answering to the moral condition of men's minds; and may be content if the divine truth, lost in the dulness of a material age, clears itself into fresh forms with the returning breath of a better time. Most readers will find suggestions of great freshness in the passage next cited:-- THE HEART OF CHRISTIANITY.