“By your blood you ransomed people for God from every tribe and language and people and nation” ( Revelation 5:9 9 And they sing a new song, saying, Worthy art thou to take the book, and to open the seals thereof: for thou was slain, and didst purchase unto God with thy blood `men' of every tribe, and tongue, and people, and nation, ). The reason God can freely and righteously turn back the hearts of sinners is because that’s what Jesus bought for all the saints, Old Testament and New. That’s what he paid for with his blood. From John Piper’s sermon, “Lord, Teach Us to Fight: The Double Battle in Gethsemane.”