“Having our hearts sprinkled”: why did he not say “having been purified”? [Because] he wished to point out the difference of the sprinklings: the one he says is of God, the other our own. For the washing and sprinkling the conscience is of God; but “the drawing near with” truth and “in full assurance of faith” is our own. Then he also gives strength to their faith from the truth of Him that promised.