"Who is pure in heart? Only those who have surrendered their hearts completely to Jesus that he may reign in them alone. Only those whose hearts are undefiled by their own evil--and by their own virtues too. The pure in heart have a child-like simplicity like Adam before the fall, innocent alike of good and evil: their hearts are not ruled by their conscience, but by the will of Jesus."

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Sinners in their natural state lie dead, lifeless, and moveless; they can no more believe in Christ, nor repent, than a dead man can speak or walk: but, in virtue of the promise, the Spirit of life from Christ Jesus, at the time appointed, enters into the dead soul, and quickens it; so that it is no more morally dead, but alive, having new spiritual powers put into it, that were lost by Adam's fall.

— Thomas Boston