Jesus came to Galilee, preaching the gospel of the kingdom of God, and saying, “The time is fulfilled, and the kingdom of God is at hand. Repent, and believe in the gospel.” (Mark 1:14b-15)
A proper love for God necessarily involves a hatred for sin that leads to repentance. That should be obvious. Who wouldn’t understand that? If we truly love someone we seek their best interests. Their well being is our greatest concern. If a man says to his wife, “I love you but I could care less what happens to you,” we would rightly question his love for her. True love seeks the highest good of its object.
If we say that we love God, then we will hate whatever is an offense to Him. Sin blasphemes God. Sin curses God. Sin seeks to destroy God’s work and His kingdom. Sin killed His Son. So when someone says, “I love God, but I tolerate sin,” then there is every reason to question the genuineness of his love for God. One cannot love God without hating that which is set to destroy Him. True love for God will therefore manifest itself through confession and repentance.
The man who loves God will be grieved over his sin and will want to confess it to God and forsake it.
In examining our faith we should ask: “Do I have a settled conviction concerning the evil of all sin? Does sin appear to me as the evil and bitter thing that it really is? Does conviction of sin increase in me as I walk with Christ? Do I hate it not primarily because it is ruinous to my own soul or because it is an offense to the God I love? Does the sin itself grieve me or am I only grieved over the consequences of my sin. What grieves me most-my misfortune or my sin? Do my sins appear to me as many, frequent and aggravated? Do I find myself grieved over my own sin more than the sins of others?”
Genuine saving faith loves God and hates what He hates, which is sin. That attitude results in real repentance.
– John MacArthur Jnr