"Lay not up for yourselves treasures upon the earth, where moth and rust doth consume, and where thieves break through and steal; but lay up for yourselves treasure in heaven, where neither moth nor rust doth consume, and where thieves do not break through nor steal, for where thy treasure is, there will thy heart be also." Toward science and art, business and politics, the application of the Christian Spirit is different from anything we have met before. The Christian will not shirk these things, like the Epicurean and the Stoic; because they are ways of serving that truth, beauty, welfare, and order which are included in the Father's will for all His human children. In all these things we are co-workers with God for the good of man. Diligence and enthusiasm, devotion and self-sacrifice in one or more of these directions is the imperative duty, the inestimable privilege of every one who would be a grateful and obedient son of God, a helpful and efficient brother to his fellow-men. Yet in all his devotion to science or art, in all the energy with which he gives himself to business or politics, the Christian can never forget that God is greater than any one of these points at which we come in contact with Him; and that, when we have done our utmost in one or another of these lines, we are still comparatively unprofitable servants in His vast household. As God is more than the thing at which we work, so the Christian, through relation to Him, is always more than his work. He never lets his personality become absorbed and evaporated in the work he does; but ever renews his personal life at the fountain which is behind the special work he undertakes to do. Thus the true Christian is never without some useful social work to do; and he never lets himself get lost in doing it. To keep this balance of energy in the task and elevation above it, which enables one to take success without elation and bear failure without depression, is perhaps the crowning achievement of practical Christianity. "The lamp of the body is the eye; if therefore thine eye be single, thy whole body shall be full of light. But if thine eye be evil, thy whole body shall be full of darkness. If, therefore, the light that is in thee be darkness, how great is the darkness! No man can serve two masters; for either he will hate the one, and love the other, or else he will hold to one, and despise the other. Ye cannot serve God and mammon."