“In this the love of God was manifested toward us, that God has sent His only begotten Son into the world, that we might live through Him.”
that we might live through Him
The word “that” expresses purpose. Without God’s purpose of sending His unique Son, the one-and-only Son, into the world to save us, we would be spiritually lost and subject to the Second Death, eternal death.
John sets the word “live” in stark contrast to the idea of spiritual death. This is to live in the absolute sense—to live forever with God. God loved us so that we could experience eternal life, His life. God loved us that we might eternally live. Physical life came through creation but spiritual life comes through the death of Christ.
God fully manifested His unconditional love to us at Calvary.
The full manifestation of God’s love is Calvary. We need no more proof than this. We can see God’s love clearly in the cross. The motive for our love is this love of God. Whoever loves like God loves, proves that he is a child of God.