In all this change, great, thorough, radical, and abiding as it really is, we recognise only the operation of the same general laws which characterise all great changes in mental character. The physical organs are affected powerfully; and the emotions are only in exact proportion to the felt importance of their objects. If exerted too much at one time, or too frequently for the healthy endurance of the cerebral organs, inflammation follows, and, with it, religious mania. Next, inasmuch as different minds are very differently constituted, so are they differently affected by the actual process of conversion to a holy life. We shall be better understood, when we say that the temperament, age, education, intellectual and affective faculties, &c., all have an influence in relation to the manner in which their minds will be brought to the realisation of religious truth, and to experience its sanctifying efficacy. Hence it is of immense importance, that those whose office it is to bring religious truth to bear upon the minds of their fellow-men, should understand the peculiar nature of the minds on which they are to exert their action. In short, they should understand phrenology familiarly and practically, and should apply it daily to their fellow-men. We will put one or two cases. If, for instance, Conscientiousness be a strong faculty in an individual, with Cautiousness also large, and at the same time he has gone on for many years in a careless worldly course of unbelief, the religious teacher would be likely to bring vividly to his mind that searching attribute of the Almighty, viz. his justice, which cannot look upon sin but with abhorrence. He would point out the purity of heaven, and contrast it with the impurity of a world lying in wretchedness, and depict the nature, desert, and awfulness of sin, &c. &c. In this way he would probably excite remorse and apprehension. But if the individual have respectable reasoning powers, he should be impressed with the utter hopelessness of entering Heaven while remaining in his sins. He cannot fail to see at once, that Heaven is no place for him, until he becomes fit for its society. The importance of things connected with religion, should be clearly set forth and contrasted with the temporary, fleeting, unsatisfactory things of this world. We may reasonably expect, that labours of this kind rendered discreetly, prayerfully, and in faith, will be availing through the influences of the Holy Spirit.