God has given us prayer as a wartime walkie-talkie so that we can call headquarters for everything we need as the kingdom of Christ advances in the world. Prayer gives us the significance of front-line forces, and gives God the glory of a limitless Provider. The one who gives the power gets the glory. Thus prayer safeguards the supremacy of God in missions while linking us with endless grace for every need.
John PiperIf the pursuit of God's glory is not ordered above the pursuit of man's good in the affections of the heart and the priorities of the Church, man will not be well served, and God will not be duly honored. I am not pleading for a diminishing of missions but for a magnifying of God. When the flame of worship burns with the heat of God's true worth, the light of missions will shine to the darkest peoples on earth. And I long for that day to come!
John PiperHere is a vocation that will bring you more satisfaction than if you became a millionaire ten times over: Develop the extraordinary skill for detecting the burdens of others and devote yourself daily to making them lighter.
John Piper