Holy Spirit

God's Holy Spirit and man's sin cannot live together peacefully; they may both be in the same heart, but they cannot both reign there, nor can they both be quiet there; for "the sinful nature desires what is contrary to the Spirit, and the Spirit what is contrary to the sinful nature;" they cannot rest, instead there will be a perpetual warring in the soul, so that the Christian will have to cry, "What a wretched man I am!  Who will rescue me from this body of death?"  But in due time: the Spirit will drive out all sin, and will present us blameless before the throne of his Majesty with exceeding great joy.

-- Charles Haddon Spurgeon