"The Word became flesh, and made His dwelling among us, and we saw His glory..."
In His humility we see His glory, for He humbled Himself to reveal His love, and thus He reveals the mystery of Himself, for God is Love.
The Infinite Mystery is revealed as Infinite Love. The Trinitarian God is the absolute, inconceivable communion of love eternally "poured out" within His own Divine life. And this Mystery has chosen, out of the freedom of love, to create free persons and invite them to share in this communion.
God is love. God loves us. Each and every one of us. His taking flesh, His life, His death for our sins, His resurrection are all the manifestation and communication of this love, which is His glory.
He is Love, and His love for us—His mercy—endures forever.
Pope Benedict XVI reflects on this at the beginning of his first encyclical in the year 2006:
"We have come to believe in God's love: in these words the Christian can express the fundamental decision of his life. Being Christian is not the result of an ethical choice or a lofty idea, but the encounter with an event, a Person, which gives life a new horizon and a decisive direction.... Since God has first loved us (see 1 John 4:10), love is now no longer a mere 'command'; it is the response to the gift of love with which God draws near to us" (Deus Caritas Est, 1).