Charles H. Spurgeon on Psalms 141:4

My heart. That man is like Esau which had an inheritance, which had a heart but now he hath not possession of his own; therefore, give God thy heart, that he may keep it; and not a piece of thy heart, not a room in thy heart, but thy heart. The heart divided, dieth. God is not like the mother which would have the child divided, but like the natural mother, which said, rather than it should be divided, let her take all. Let the devil have all, if he which gave it be not worthy of it. God hath no cope-mate, therefore he will have no parting of stakes, but all or none; and therefore he which asks here thy heart, in the sixth of Deuteronomy and the fifth verse, asketh "all thy heart, all thy soul, and all thy strength"; thrice he requireth all, lest we should keep a thought behind. Yet it is thy heart, that is, a vain heart, a barren heart, a sinful heart, until thou give it unto God, and then it is the spouse of Christ, the temple of the Holy Ghost, and the image of God, so changed, and formed, and refined, that God calls it a new heart. There is such strife for the heart as there was for Moses's body. "Give it me", saith the Lord; "give it me", saith the tempter; "give it me", saith the pope; "give it me", saith riches; "give it me", saith pleasure; as though thou must needs give it to some one. Now here is the choice, whether thou wilt give it to God or the devil; God's heart or the devil's heart; whose wilt thou be? —Henry Smith.