How can it be explained? It is so huge and wonderful and beyond description.
He could have forced us to love Him, but then that wouldn't really be love would it.
Instead He pursues us and gives us with everything- Himself.
There on the cross the God of the Universe died, arms outstretched, taking our sin and calling for us to come to Him.
God's love is freely given, undeserved, unrestrained, complete, and cannot be earned. Nothing, not even sending His Son to the cross, is to costly to show His love.
And what does he get in return?
"He gets adopted children who are petty, petulant, spoiled, demanding, argumentative, mistrusting, angry, critical and an irritant to everyone but God... Nevertheless, our God bought us with an infinite price and intends on seeing us crowned with His very glory. Is is any wonder that Paul shouts at the top of His lungs, :I pray that you, being rooted and established in love, may have the power, together with all the saints, to grasp how wide and long, and high and deep is the love of Christ, and to know this love that surpasses all knowledge-that you may be filled to the measure of all the fullness of God." (Eph. 3:17-19) Paul prays that I will know the unknowable love and be so full of God that I achieve dimensions of being that reflect the boundlessness of God." -Dan B. Allender
(quote found in Becoming a Woman of Purpose by Cynthia Heald)
That is also my prayer for both you and me- that we may know God and His love, though they are too great to understand, more and more fully and be filled to the overflowing with His love, grace and joy.