Isaac’s love of wild game linked him to his eldest son Esau, who was a hunter. His other son Jacob was a trickster, and used his father’s desire for game meat to deceive him — and in so doing gained the birthright that would have gone to Esau.
Paul the apostle writes of “the first Adam” and “the last Adam”. The first Adam was created and declared to be “good”. He was not predisposed to sin but chose to disobey God. Had he not sinned, his firstborn son Cain would not have been predisposed to sin. The “dog” was “lying at his door” but he did not have to let it in. He did though, and murdered his brother Abel. Cain chose to ‘let the dog in” just as his father Adam had done — but unlike Adam, Cain by nature was predisposed to sin.
Jesus, the “last Adam”, was not created but “begotten” (generated) through the Holy Spirit and conceived by the virgin, Mary. Jesus was not predisposed to sin because he had the divine nature of his Father, and although tempted like the first Adam, chose not to sin.
When “born from above” we receive the nature of Jesus, which is the nature of God our heavenly Father. We are then baptized in water in an act of identification with Jesus. Prayer and the study of God’s Word prevents us from doing the things that we could do. As the saying goes: “We cannot stop the birds from flying overhead, but we can stop them from nesting in our hair.”
A person is tempted through an inherited, genetic predisposition in regard to a certain thing. The devil ‘lets a dog out’, and their mind allows it to enter. Jesus said, “The prince of this world comes but finds nothing in me.” (John 14:30) Nothing of his evil nature; no echo of his evil accusations.
Does he find anything in you that responds to the thing he offers? Through pornography, demons build a ‘nest’ ‘twig by twig’ so to speak, until it is hard to get them ‘out of your hair’. God, of course, can remove them in a single act of power, but to stay free you need to count yourself “dead indeed to sin but alive unto God through Jesus Christ.”
You are a new creation in Christ, so the old predisposition to sin ought to be gone, forgotten. Your new nature, the nature of Christ, predisposes you to holiness! The Devil may ‘let the dog out’ in the form of a tempting, whispering demon, but he does so in vain because when Jesus baptizes you in the Holy Spirit, he ‘sends the dove in’!