“If I could speak all the languages of earth and of angels, but didn’t love others, I would only be a noisy gong or a clanging cymbal.” 1 Corinthians 13:1 NLT
Maybe the best way to understand eternal security is to understand that Jesus alone possesses eternal life because He is Eternal Life. (For the life was manifested, and we have seen it, and bear witness, and shew unto you that eternal life, which was with the Father, and was manifested unto us;) 1 John 1:2 KJV
1 John 5:11 and the testimony is this, that God has given us eternal life, and this life is in His Son.
“But he himself was wounded because of our iniquities. He was bruised because of our wickedness. The discipline of our peace was upon him. AND BY HIS WOUNDS, WE ARE HEALED.” Isaiah 53:5 (Catholic Public Domain Version)