Then, after desire has conceived, it gives birth to sin; and sin, when it is full-grown, gives birth to death. James 1:15
Where does sin begin? Are you in control of your mind? One thing Jesus tried to teach us is nothing outside that defiles us but what comes out of our heart and mind that defiles us (Mark 7:15) Sin takes root in your mind and heart, and when you let it manifest and fantasize about it, it eventually becomes reality, which ultimately leads to death, as we know the wages of sin is death (Romans 6:23)
So knowing this its important we refrain from evil influences such as pornography, watching violence and hatred on TV and movies, listening to hateful and evil messages in music. You are what you think (Proverbs 4:23) When you subject yourself to evil thoughts and imaginations, it becomes your reality. This is why we are not to conform to the ways of the world but renew your mind in Christ (Romans 12:2)
Jesus said anyone who even looks at a woman lustfully has already committed adultery (Matthew 5:28) Why? Because of the same concept, your imagination plants the seed for sin. We must learn to get control of our minds and hearts. Guard your heart for everything you do flows from it (Proverbs 4:23) Meaning if there is sin in your heart there will be sin in your life.
And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus. (Philippians 4:7) If you want the salivation and peace of God, set your minds on things above and not earthly things (Colossians 3:2) in Jesus Name Amen