As the Scriptures provide the foundation for understanding spiritual truths and the existence of spiritual beings, including Satan, they do not direct us to seek or validate those truths through sources outside of the Bible. The Bible presents itself as a self-contained revelation from God, encompassing the knowledge necessary for salvation and understanding of the spiritual realm.

However, the Bible acknowledges the reality of spiritual warfare and the influence of unseen spiritual forces in the world. Ephesians 6:12 states, “For we do not wrestle against flesh and blood, but against the rulers, against the authorities, against the cosmic powers over this present darkness, against the spiritual forces of evil in the heavenly places.”

While the Bible does not direct us to external evidences for the existence of Satan, it does show that the reality of good and evil, and the conflict between the two, is evident in the moral and spiritual struggles experienced by humanity. This can be seen in the widespread acknowledgment across various cultures and religions of a struggle between good and evil, often personified in figures that resemble the biblical depiction of Satan or demonic forces.

It’s also important to note that the Bible encourages faith and trust in God’s word and revelation. Hebrews 11:1 tells us, “Now faith is confidence in what we hope for and assurance about what we do not see.” Thus, for those who accept the Bible’s authority, the evidence of Satan and spiritual realities is accepted by faith in God’s revelation.

While the existence of Satan as described in the Bible may not be proven through external sources in a way that satisfies empirical inquiry, the impact of his influence—seen in the presence of evil, temptation, and rebellion against God—corresponds with the biblical narrative and the human experience of moral and spiritual conflict.

The existence of Satan is affirmed through various passages within the Scriptures, illustrating his interactions with both God and humanity, his influence over the world, and his ultimate destiny.

From the onset, in the Book of Genesis, Satan appears as the serpent who tempts Eve to sin, leading to the fall of humanity. “Now the serpent was more crafty than any of the wild animals the Lord God had made. He said to the woman, ‘Did God really say, “You must not eat from any tree in the garden”?’” (Genesis 3:1). This narrative sets the stage for Satan’s opposition against God and His creation.

In the Book of Job, Satan presents himself before God, challenging Job’s faithfulness. God permits Satan to test Job, illustrating Satan’s role as the accuser and adversary. “Then Satan answered the Lord and said, ‘Does Job fear God for no reason? Have you not put a hedge around him and his house and all that he has, on every side?’” (Job 1:9-10).

The New Testament continues to affirm Satan’s existence and influence. In the Gospels, Satan directly tempts Jesus in the wilderness, attempting to divert Him from His divine mission (Matthew 4:1-11). Jesus Himself speaks of Satan as a real being, referring to him as “the ruler of this world” (John 12:31) and teaching about his eventual defeat.

The apostle Peter warns believers to be vigilant against Satan’s designs: “Be sober-minded; be watchful. Your adversary the devil prowls around like a roaring lion, seeking someone to devour” (1 Peter 5:8).

Finally, the Book of Revelation portrays Satan’s ultimate defeat and punishment, ensuring believers of his real yet defeated status. “And the devil, who deceived them, was thrown into the lake of burning sulfur, where the beast and the false prophet had been thrown. They will be tormented day and night for ever and ever” (Revelation 20:10).

These passages, among others, provide a coherent narrative that affirms the existence, activity, and eventual defeat of Satan, serving as evidence within the biblical framework for those who accept its authority and teachings.