If what comes from the heart is evil, why does God want us to love him with all our hearts?
I assume your question comes from Matthew 22:37, Mark 12:30, or Luke 10:27. I’ll read Mark 12:30-31 which says, “And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment. And the second is like, namely this, Thou shalt love thy neighbour as thyself. There is none other commandment greater than these.” Of course, when the heart is spoken of here, it is not the literal blood-pumping organ that is being referred to. It is the spirit and soul of a person…his intellectual and emotional being. The heart of the believer is capable of knowing, loving, and obeying God. When we delight ourselves in the Lord, He gives us the desires of our hearts, as we read in Psalms 37:4 – “Delight thyself also in the LORD; and he shall give thee the desires of thine heart.”
The unrepentant, unsaved man has a heart that is truly evil or wicked. We read in Genesis 6:5 that, “GOD saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually.” Jeremiah 17:9 says that, “The heart is deceitful above all things, and desperately wicked: who can know it?” Without Christ, there is only evil in the hearts of men and women, but to those who know Christ as their savior, we are made new and have the promise that as we delight ourselves in the Lord that He will give us the desires of our heart. Of course, when we delight ourselves in the Lord, the desires of our heart change drastically. We’ll only want those things that please and honor the Lord.
As believers on the Lord Jesus Christ, the Lord wants us to love Him with all our heart, soul, mind, and strength. And let’s not forget the rest of the Lord’s instruction in Mark 12:31 and that is to love our neighbor as ourselves.