Biblical Root of Agape
"Agape indicates an unconquerable benevolence, invincible goodwill. If we regard a person with agape, it means that no matter what that person does to us, no matter how he treats us, no matter if he insults us or injures us or grieves us, we will never allow any bitterness against him to invade our hearts, but will regard him with that unconquerable benevolence and goodwill which will seek nothing but his highest good. From this certain things emerge."
"Agape does not mean a feeling of the heart, which we cannot help, and which comes unbidden and unsought; it means a determination of the mind, whereby we achieve this unconquerable goodwill even to those who hurt and injure us. Agape, someone has said, is the power to love those whom we do not like and who may not like us. In point of fact we can only have agape when Jesus Christ enables us to conquer our natural tendency to anger and to bitterness, and to achieve this invincible goodwill to all men."
Wm. Barclay’s The Daily Study Bible Series
"I give you a new commandment: love one another. As I have loved you, so you also should love one another. This is how all will know that you are my disciples, if you have love for one another" New American Bible, Revised Edition (NABRE) Jn 13:34–35.
"I have told you this so that my joy may be in you and your joy may be complete. This is my commandment: love one another as I love you.…You are my friends if you do what I command you.…It was not you who chose me, but I who chose you and appointed you to go and bear fruit that will remain, so that whatever you ask the Father in my name he may give you. This I command you: love one another" (NABRE), Jn 15:11–17.
"…let us love one another, because love is of God; everyone who loves is begotten by God and knows God. Whoever is without love does not know God, for God is love. In this way the love of God was revealed to us: God sent his only Son into the world so that we might have life through him. In this is love: not that we have loved God, but that he loved us and sent his Son as expiation for our sins. Beloved, if God so loved us, we also must love one another. No one has ever seen God. Yet, if we love one another, God remains in us, and his love is brought to perfection in us" (NABRE) 1 Jn 4:7–12.