Blessed be the God and Father of our Lord Jesus Christ,
who has blessed us in Christ
with every spiritual blessing in the heavenly places,
even as he chose us in him before the foundation of the world,
that we should be holy and blameless before him.
In love he predestined us for adoption through Jesus Christ,
according to the purpose of his will,
to the praise of his glorious grace,
with which he has blessed us in the Beloved.
Ephesians 1:3-6
Why the Gospel? Because God loved us.
How's that for a Sunday School answer?
Yet, I want us to focus on the characteristic of this love: it is a sovereign love. God doesn't love sometimes or love when He feels like it. God always loves because God is love. Theologian John Murray put it this way and I quote it here because I like it: "He is love, and that necessarily, inherently and eternally." God is always love; forever. So much so, that whatever God wills or does is love. We can't fully grasp this because we can't always be love. We are unloving, and for most of the time, unlovable. That's the beauty of the gospel; it is God's love demonstrated to the unlovable (Romans 5:8). Now, you may be wondering how this answers the question of why the gospel. Shouldn't it be that we are sinners, enemies of God, needing his grace? While that is most certainly true it doesn't get to why God would do any saving at all! The answer to the "why" is that God chose, out his good pleasure (i.e. his love!), to save a people to be heirs with and through Jesus Christ.
So, what is the love of God actively doing in the gospel? According to this passage, it elects and predestines. This electing and predestination have an immediate and ultimate application. Immediately, we are holy and blameless before God. This is true, not because we are good enough or because the ability to do good was infused to us. It is solely because of the merit of Christ on whose basis we can stand before God through faith, as Paul would further this thought out in chapter 2 of this letter. God loved us and chose to show this love by choosing us before there was an "us" in order that we would be holy and blameless adopted heirs. Since we didn't earn this, it is nothing we can look to as warranting God's love. He simply, freely and sovereignly gave it.
The ultimate application in all of this is that we would marvel at God's grace. The opening phrase of verse 3, "Blessed be the God and Father of our Lord Jesus Christ," and the phrase in verse 6, "to the praise of his glorious grace," tell us to give God glory because his God is so glorious. The sovereign love of God predestines people in order that the sovereign love of God (and more specifically God Himself) would be glorified. Seems rather self-serving...that is until we remember that all that God does is love; necessarily, inherently and eternally.
There is one last phrase that we need to explore to round out this sovereign love. We were chosen and predestined "according to the purpose of his will." God planned to do it. He planned to demonstrate his sovereign love. A commentator put it like this, "When the Father chose a people for himself, deciding to adopt them as his own children, he was motivated by love alone. Hence, what he did was a result not of sheer determination but of supreme delight." It delighted God to love us; to choose us. I delight in my wife. I delight in her love for me but it is when I can delight in loving her that I am most delighted. And God planned the gospel in order to delight in our salvation. Staggering.
God, in love, chose a people to be right in his sight. God, in love, predestined a people to glorify Him. All this, according to his will.
So, why the Gospel? Because God loved us.