By conversion the temper and disposition are changed and sanctified. Christians are occasionally to be found with a tone of mind and a temper as little calculated to recommend their faith as to promote their happiness. I believe that there are cases in which this is due to a deranged condition of the nervous system, or the presence of disease in some other vital organ. These unhappy persons are more deserving of our pity than our censure. This is not only the judgment of Christian charity, but of sound philosophy, and is a conclusion to which we are conducted in studying the union between mind and body, and the manner in which they act and re-act upon each other. So long as grace dwells in a "vile body," which is the seat of frequent disorder and many diseases--these infirmities of temper admit no more, perhaps, of being entirely removed, than a defect of speech, or any physical deformity. The good temper for which some take credit may be the result of good health and a well-developed frame--a physical more than a moral virtue; and an ill temper, springing from bad health, or an imperfect organization, may be a physical rather than a moral defect--giving its victim a claim on our charity and forbearance. But, admitting this apology for the unhappy tone and temper of some pious men, the true Christian will bitterly bewail his defect, and, regretting his infirmity more than others do a deformity, he will carefully guard and earnestly pray against it. Considering it as a thorn in his flesh, a messenger of Satan sent to buffet him, it will often send him to his knees in prayer to God, that the grace which conquers nature may be made "sufficient for him."