It is not well that our chief object should be to enjoy the consolations of religion; it is better to seek first to do the duties enjoined by religion. Our first question should be, not, How may I enjoy God? but, How may I glorify Him? 'A single eye to His glory' means that even our comfort and joy in religious exercises shall be subordinated, and (if need were) postponed, to the doing of His will. While, on the one hand, there is no more certain means of enjoying Him than that of humbly seeking to walk in the ways of His commandments, on the other hand, there is nothing more evanescent in its nature than a mere emotion, even though it be that of joy in God, unless it be turned into a spring of action for God. Such emotions, like photographs, vanish from the heart unless they be fixed. Work for God is the way to fix them. Joy in God is the strength of work for God, but work for God is the perpetuation of joy in God. Here is the figurative expression of the great evangelical principle, that works of righteousness must follow, not precede, the restoration of the soul. We are justified not by works, but for works, or, as the Apostle puts it in a passage which sounds like an echo of this psalm, we are 'created in Christ Jesus unto good works, which God hath before ordained _that we should walk in them_.' The basis of obedience is the sense of salvation. We work not _for_ the assurance of acceptance and forgiveness, but _from_ it. First the restored soul, then the paths of righteousness for _His_ name's sake who has restored me, and restored me that I may be like Him. But there is yet another region through which the varied experience of the Christian carries him, besides those of rest and of work. God leads His people through sorrow. 'Yea, though I walk through the valley of the shadow of death, I will fear no evil.' The 'valley of the shadow of death' does not only mean the dark approach to the dark dissolution of soul and body, but any and every gloomy valley of weeping through which we have to pass. Such sunless gorges we have all to traverse at some time or other. It is striking that the Psalmist puts the sorrow, which is as certainly characteristic of our lot as the rest or the work, into the future. Looking back he sees none. Memory has softened down all the past into one uniform tone, as the mellowing distance wraps in one solemn purple the mountains which, when close to them, have many a barren rock and gloomy rift, All behind is good. And, building on this hope, he looks forward with calmness, and feels that no evil shall befall.