Editorial Vida, in this edition of "Biographies of Great Christians," briefly presents simplified biographies of some of the most prominent figures in Christ's Church from the last century and the beginning of the present one. Many wonder what can be attributed to the incredible success of servants of God like Luther, Bunyan, Wesley, Whitefield, Finney, Carey, Judson, and so many others. Certainly neither their talents nor their willpower. The true mystery of the greatness of great Christians has been, and is, prayer. For those who walk with God in prayer, as they did, there is no mystery in this. And for everyone, the lives of these men are very appealing; their biographies inspire us and show us that the victory of a Christian depends on prayer.