"Celestial light Shine inward, and the mind through all her powers Irradiate; there plant eyes, all mist from thence Purge and disperse!" MILTON. The total renovation of the heart is evinced by susceptibility of conscience. This moral faculty, in an unregenerate state, is either perverted or hardened. In the former case, our obligations are not clearly discerned, or are easily dispensed with; in the latter, the most powerful appeals to love or fear are resisted. In the progress of sin to its most awful consummation, those gentle whispers which were at first noticed, and made the transgressor tremble till he sometimes let fall the forbidden fruit, are at length unheard. Every intimation is silenced by guilty merriment, which perhaps was at first forced, but soon becomes habitual. Where conscience is not lulled into total inaction, it is, in this state of character, violated with little remorse. The mind loses sight of the glory of God, its best regulating principle; it is alive to personal interests only, and discards every thing of a nobler nature. But, in the sincere and humble Christian, conscience is tender, easily offended with evil, and gradually approximating that state of susceptibly in respect to sin, in which it resembles a well-polished mirror, that shows the slightest particle of dust or damp upon its surface. Such a conscience is no less _rigorous_ than it is tender, and repels temptation with persevering energy. It will hold no debate with the tempter; and so far from seeking to ascertain how far it may advance towards sinful compliances without contracting actual guilt, it will "abstain from all _appearance_ of evil." In stating that the heart is the seat of those principles and the source of that transformation of character which is comprehended in the term _conversion_, it is intended to express the _permanent_ nature of the change. It is not an opinion or an emotions resembling the morning cloud and early dew that pass away, but an abiding and deep-wrought alteration. "He which hath begun a good work in you, will carry it on until the day of Christ Jesus;" in consequence of which, "the path of the just is as the shining light that shineth more and more unto the perfect day."