Now sin is what comes out of our own heart. Jesus said "it isn't actually the thoughts that come into your head from outside that are sin, it isn't even the feelings that come in from outside that are sin, it isn't even the food that comes in through your mouth, but it's what comes from inside. In Matthew 15:17, "Do you not see that whatever goes into the mouth, passes into the stomach and so passes on, but what comes out of the mouth proceeds from the heart and this defiles the man, for out of the heart come evil thoughts, murder, adultery, fornication, theft, false witness, slander. These are what defile a man. But to eat with unwashed hands, does not defile a man. For you see in verse 18, what comes out of the mouth, proceeds from the heart and this defiles a man. It's not what you eat or even what you drink or even the thoughts that other people pass on to you that defiles you. It's what comes out of your heart and mind. That's what dirties us and what defiles us. So the real problem of sin is in the heart. Now you can try all you want to cover it up, make excuses, or attempt to lower God's standard. None of these things solve the problem of sin in the heart.The Bible is clear, it not only demands victory over sin but also truly expects a person to walk in it.Rom 6:12-14, "Let not sin therefore reign in your mortal body, that you should obey it in the lusts thereof. Neither yield your members as instruments of unrighteousness unto sin: but yield yourselves unto God, as those that are alive from the dead, and your members as instruments of righteousness unto God. For sin shall not have dominion over you: for you are not under the law, but under grace."1 John 3:5, "And you know that He was manifested to take away our sins; and in Him is no sin. Whosoever abides in Him sins not: whosoever sins has not seen Him, neither known Him. Little children, let no man deceive you: he that does righteousness is righteous, even as He is righteous. He that commits sin is of the devil; for the devil sins from the beginning. For this purpose the Son of God was manifested, that He might destroy the works of the devil. Whosoever is born of God doth not commit sin; for His seed remains in him: and he cannot sin, because he is born of God In this the children of God are manifest, and the children of the devil: whosoever does not righteousness is not of God, neither he that does not love his brother."Your outward life is an indication of what is in your heart because your outward life comes from your heart. God has already made full provision for your unclean heart. That's what Calvary is about. That dear old heart of yours, that gives you such trouble with unclean thoughts. Look at your heart, does it have anger, pride, jealousy and resentment? Well that heart was put into Jesus and was destroyed. As He rose from the dead, you rose with Him and there's a clean heart that Jesus can impart to you through the fullness of the Holy Spirit. That's the step that you need if your heart is not yet clean. It happened on Calvary and now are you willing to reckon yourself dead indeed on to sin and alive to God in Christ Jesus? Now take God at His word and believe. That unclean heart of yours was crucified with Christ. The old heart was crucified with Christ and He has already given you His clean and pure heart. In other words, faith like that, springs up in your heart the moment you've given everything to Jesus. Then the Holy Spirit comes in and cleanses your heart by your faith and keeps it cleansed as you continue to have faith that you were crucified with Christ and as you continue to submit to the Holy Spirit. With a clean heart instead of trying to excuse any sin or trying to justify the things that you know are sin, s instead of justifying them, you find they don't even exist or rise up in your heart. That's what a clean heart means.