This is one of the verses that we named this site for. There are a lot of people who claim they have “given their heart to the Lord,” but have never repented. Over and over, the Bible declares that we are to repent when we come to the Lord. But, do they know what they are to have repented from?
Now the works of the flesh are evident, which are: adultery, fornication, uncleanness, lewdness, idolatry, sorcery, hatred, contentions, jealousies, outbursts of wrath, selfish ambitions, dissensions, heresies, envy, murders, drunkenness, revelries, and the like; of which I tell you beforehand, just as I also told you in time past, that those who practice such things will not inherit the kingdom of God.
If you have never repented (changed your thinking so much so that you turn from sin and turn to the Lord), it is time to do it.