The very same as you should not open the door of your house to any stranger, you must not open the door of your heart to evil. If you do, they will come in and destroy you.
If you open your heart to temptation, lust, envy, jealousy, evil desires, rage, pride, self pity, anxiety, fear, animosity, hatred, enmity, doubt and other demonic influences, then you have allowed them in and given them legal right to live in you. They will entangle and enslave you so that you will not be able to exercise your free will any more. In the end they will control you and cause you to do things that you do not want to do, that will destroy your life and cause you to end up in hell.
Jesus said:"Truly, truly, I say to you, everyone who commits sin is the slave of sin."John 8:34 The wages of sin is death. Jesus came to set men free from the bondage of sin and addictions. “So if the Son makes you free, you will be free indeed."John 8:36. If you accept Jesus and invite Him into your life, He will set
you free from the bondage of sin, but then you have to reject and evict those evil forces that you invited into your heart.
Once Jesus has set you free, if you open the door to the devil and his demons, they will come in and enslave you again, and you will be worse off than before. Jesus said:"43“Now when the unclean spirit goes out of a man, it passes through waterless places seeking rest, and does not find it. 44“Then it says, ‘I will return to my house from which I came’; and when it comes, it finds it unoccupied, swept, and put in order. 45“Then it goes and takes along with it seven other spirits more wicked than itself, and they go in and live there; and the last state of that man becomes worse than the first. That is the way it will also be with this evil generation.”Matthew 12:42.
That is why Christian believers who once accepted Jesus, were set free from the bondage of sin, and then opened the door to sin, often become worse sinners than they were before. Many have been deceived to think that they are saved, even if they go back to sin. They will perish if they do not find repentance and deliverance from their sin. If you sin you will burn. No sinners will enter heaven.
Do not open the door to satan. If you have become entangled in sin and addictions again, you need to run back to Jesus. Only Jesus can set you free. The apostle James wrote:"Submit yourselves, then, to God. Resist the devil, and he will flee from you. 8Draw near to God, and He will draw near to you. Cleanse your hands, you sinners, and purify your hearts, you double-minded. 9Grieve, mourn, and weep. Turn your laughter to mourning, and your joy to gloom. 10Humble yourselves before the Lord, and He will exalt you."James 4:7.
Do not open the door to satan. Do not become conformed to the world. Do not watch TV and movies. Do not watch pornography. Do not participate in the same senseless sinful entertainment that the sinners do, in drinking and parties. Do not waste your money on sports. Do not play video games. You will be trapped by the devil. Be holy. Avoid temptation. Keep your mind clean, reserve it for Jesus. We read in James 4:4 "You adulteresses! Do you not know that friendship with the world is hostility toward God? Therefore, whoever chooses to be a friend of the world renders himself an enemy of God. 5Or do you think the Scripture says without reason that the Spirit He caused to dwell in us yearns with envy?" If you open the door to the devil, he will come in and destroy you and you will end up in hell.
Invite Jesus in, invite His Holy Spirit to dwell in you. Pray, seek Him, listen to Him, follow and obey Him. Reserve yourself for Jesus and do what is pleasing to Him. Stay with Jesus and you will stay free. Do not open the door to satan.
May Jesus bless you.