The intellect is to be kept thoroughly awake with new, earnest, whole-hearted work. How is it to be done? The power of the Holy Spirit must purify the thoughts and cleanse the soul of its moral defilement. Defiling habits not only abase the soul, but debase the intellect. Memory suffers, laid on the altar of base, hurtful practices. “He that soweth to his flesh shall of the flesh reap corruption; but he that soweth to the Spirit shall of the Spirit reap life everlasting.” When teachers and learners shall consecrate soul, body, and spirit of God, and purify their thoughts by obedience to the laws of God, they will continually receive a new endowment of physical and mental power. Then will there be heart-yearnings after God, and earnest prayer for clear perception to discern. The office and work of the Holy Spirit is not for them to use it, as many suppose, but for the Holy Spirit to use them, molding, fashioning, and sanctifying every power. The giving of the faculties to lustful practices disorders the brain and nerve power, and though professing religion, they are not now and never will be agents whom God can use; for He despises the practices of impurity, which destroy the vital nerve energies. This sin of impurity is lessening physical vigor and mental capabilities, so that everything like mental taxation will after a short time become irksome. Memory is fitful; and, O what a loathsome offering is thus presented to God! (FE 227.1) MC VC