If we suggest that humanity is innately evil, then any wrongdoing must be excused since it would stem from one's very nature rather than perverse intent; one could argue that if man is created evil, he cannot justly be held accountable for evil acts, nor could he be subject to reform, as only the corrupt are capable of transformation. This reasoning clearly leads to absurdity, grounded in the false premise that humans were created with inherent evil.
The teachings of Jesus clearly show that humanity was not created evil. God commands that we love Him and fulfill His will: to love all people, treat others as we wish to be treated, show love to our enemies, act kindly even toward those who oppose us, and lay down our lives for one another. By embodying these actions, we strive to attain His likeness: "Be perfect as your heavenly Father is perfect" (Matthew 5:48). If God requires such love from humanity, even under the threat of judgment for failure to comply, it confirms that humans are indeed capable of fulfilling these divine expectations. It would be profoundly unfair for God to impose demands that are impossible to meet. Therefore, it follows that humanity must have been created good, endowed with the ability to do good, while evil exists outside of us.
Humans possess free will, which allows them to either comply with or reject God’s directives, aligning their will with God’s goodness or straying into wrongdoing. This divergence from God’s will and the commitment of sinful acts stem from a misdirection of human will, influenced by a will that is not divine.
Consequently, it can be deduced that humans are not beasts; if they occasionally act in a beastly manner, it is due to their own choices leading them away from God’s guidance. Luther wrote about the universal struggle individuals face: "Who among us has not experienced... how in the holiest moments, in the most reverent hours of his mood, such evil and tempting thoughts have come to him, which he would like to give up, and concerning which he is clearly aware that they have not in him their final origin? We all repeatedly experience that we have to fight not just with flesh and blood, but with the mysterious world of dark forces, whose actions penetrate into our inner being" (Apologia of Christianity. 12).
Evil is indeed something external to human nature and is recognized by those who are attuned to their moral choices. A conscientious individual must acknowledge the struggle between good and evil within themselves and often hears an antagonistic voice urging them to commit wrongful acts. When yielding to this voice, one might feel enslaved by an external will. This ominous influence, which seeks to lead humanity to destruction, is commonly understood by those who reflect on such experiences. Since no one desires harm for themselves, it becomes clear that this unsettling force is not born from within but is an external temptation. This spectral entity, known as the spirit of evil, or the evil spirit, also resonates across cultures and epochs, a belief that has been passed down through the ages, recognized by both the common folk and esteemed philosophers.
The conviction in the presence of malevolent spirits transcends societal barriers and has been woven into the cultural fabric of humanity. Just because these spirits are unseen and intangible does not invalidate their existence; our experiences of confronting a hostile force, an alien will that seeks to enslave us, serve as compelling evidence for its reality. Such evidence is indeed found in the Gospels.
Jesus spoke frequently of evil spirits, referring to them as the devil, Satan, and the ruler of this world. He instructed us to pray to our heavenly Father for deliverance from the evil one. In His parable of the tares, He illustrated the work of evil spirits, and He cast out demons, who obeyed His command. Thus, Jesus’ acknowledgment of evil spirits stands as sufficient truth for His followers, who trust in His words. Conversely, those who reject Christ face the implication that He recognized the existence of evil spirits, a truth they must grapple with.
In an effort to diminish the weight of this admission, some argue that Jesus merely echoed the superstitions of His time or regarded those He healed as merely afflicted by mental illness. Yet such claims contradict the acknowledged wisdom of Jesus, respected even by skeptics. Detractors sometimes assert that Jesus did not truly believe in evil spirits and only spoke of them to align with contemporary Jewish beliefs, but to claim this casts Jesus in the light of a deceiver, which conflicts with the recognition of His moral integrity.
Therefore, if even non-believers acknowledge that Jesus could not have lied or spoken of concepts He did not understand or believe, it must be accepted that every word of Christ is truthful, including His teaching on the existence of evil spirits.