Lack of love spawns forth hatred and evil leading to an eternity spent without the presence of God.
Whosoever hateth his brother is a murderer: and ye know that no murderer hath eternal life abiding in him. (1 John 3:15 KJV)
Hate is a very strong word and a quickly heated emotion that can quickly wrap you up in eternal chains as it takes up residence deep within your heart. God aligns the propensity to hate right alongside the sin of murder taking its existence in the heart of mankind very seriously His presence is always marked by love.
Those who profess to have the Holy Spirit of God dwelling within their heart can find themselves falling into a hateful attitude from time to time, however, hate cannot dwell or take up permanent residence inside the heart of man where the Spirit of God resides. The spirit of the god of this world and God are spiritual opposites and cannot both reside side by side in the heart of man. Mankind is either controlled by the Holy Spirit of God and operating in Christlikeness or is echoing the darkened spirit of the god of this world with evil and darkness spewing forth from the heart.
Cain was controlled by hate and evil which enveloped his heart as he sinned against God murdering his brother Abel shedding his innocent blood upon the ground which cried out in his condemnation from the grave.
Jesus Christ under spiritual essence of God the Father allowed Himself to be hated, persecuted and heinously secured to the cross shedding His precious blood in payment for all sin bringing about His eternal gift of unconditional love, grace, and mercy, despite the persecution He faced, making His free gift available for anyone who will receive it.
Is your heart being controlled by the love and peace of God or the hate and evil of the god of this world? One leads to life and eternity with God and the other to death and an eternity spent without God in the fires of Hell.