God so loved the world that He gave His only Son, so that everyone who believes in Him might have eternal life.
Now here is love. God the Father loves us so much that He sent His Son Jesus to suffer and die on the cross for us. The Father and the Son did not have to do this. God would only have had to will the world's redemption. He is God, after all. But the way He chose is so much more fitting, and it expresses His overwhelming love so much better.
In fact, we can look at what Jesus has done for us, knowing that He would have done the same thing if we were the only ones in need of salvation, and we can recognize the depths of His love and of the Father's love.
Our response to this love must, of course, be faith that works in love and is expressed in love. We can also look forward to the next great gift that God wants to give us: eternal life. We can start living this life already by God's grace, and we will experience it fully in Heaven when we will see Him face to face.