[12] The Christian parent may ask, What am I to teach my child? The answer is simple. Teach him only such things as will prove useful to him as a servant of Christ. Do not teach him aught which you know would prove a positive source of defilement or weakness to him should he remain here. We are seldom at a loss to know what kind of food to give our children. We are tolerably well aware of what would prove nourishing and what would prove the reverse. Now, were the instincts of the new nature as true and as energetic in us as those of the old, we should, I am persuaded, be at as little loss to decide in reference to what we should teach our children. In this, as in every thing else, it may be said, "If thine eye be single, thy whole body shall be full of light." If we have a deep sense of Christ's glory, and a sincere desire to promote it, we shall not be left in perplexity; but if our body is not "full of light," we may be assured our "eye" is not "single." But it may be urged, Our children will crave a little worldly enjoyment, and we must indulge them. We cannot put old heads upon young shoulders. I reply, Our own hearts often crave a little of the world likewise. Shall we indulge their craving? No; but judge it. Exactly so. Do the same in reference to your children's craving. If I find my children going out after the world, I should immediately judge and chasten myself before God, crying to Him to enable me to put it down, so that the testimony may not suffer. But I cannot but believe that if the parent's heart is, from its centre to its circumference, purged of the world, its principles, and its lusts, it will exert a mighty influence upon his whole house. This is what makes this entire question one of such vast magnitude and practical weight. Is my house a just criterion by which to judge of my real condition? I believe the whole teaching of Scripture is in favor of an affirmative. This makes the matter peculiarly solemn. How am I walking before my family? Is my whole course and character so unequivocal that all can see that my one supreme object is Christ, and that I would just as soon, if I could, unlock the portals of hell, and let my children in, as educate them for the world, or seek the world for them?