From God is the Gospel–
“The good news is that the King himself has come, and these enemies have been defeated, and if we trust in what he has done and what he promises, we will escape the death sentence and see the glory of our Liberator and live with him forever.”
Piper continues to note how this can free us from our self-pity in our suffering, and empower us to love those who are suffering.
The Great News is amazingly simple at one level, but amazingly complex at others.
“Gospel doctrine matters because the good news is so full and rich and wonderful that it must be opened like a treasure chest, and all its treasures brought out for the enjoyment of the world. Doctrine is the description of these treasures.”
That certainly recovers doctrine from the stuffy setting of academia. I’ve utilitized the answer to the first question of the Westminster Shorter Catechism to inform me about the joy and benefit of doctrine. True doctrine enables me to “glorify God and enjoy Him forever.” It is not just for my head, but also for my heart- that it may sing a song of freedom and inexpressible joy.