Let him who is taught the word share all good things with him who teaches.
Do not be deceived; God is not mocked, for whatever a man sows, that he will also reap. For he who sows to his own flesh will from the flesh reap corruption; but he who sows to the Spirit will from the Spirit reap eternal life. And let us not grow weary in well-doing, for in due season we shall reap, if we do not lose heart. So then, as we have opportunity, let us do good to all men, and especially to those who are of the household of faith. Galatians 6:6–10 (RSV)
Luther taught that a theologian of the cross would say what a thing is and not seek a theological way out. A true theologian will not sugar coat God's Word nor try to explain the hard parts away. A theologian of the cross looks to the suffering and death of Jesus and refuses to blink. He will say to all around him, 'See what sin, your sin and mine, have done! Can any of us pretend that this is not our doing?'
St. Paul was a theologian of the cross. He never hesitated to say what needed saying. He was not concerned if his hearers were pleased or comfortable with his words. If it needed to be said, it needed to be said. Trying to soften the Word to make it more pleasing to the ears puts people's salvation in danger.
St. Paul is not happy with the Galatian Church. They have listened to preachers of glory, preachers like the wealth 'gospel' hucksters of our present time. They talk only about the great and wonderful things God will do for you if you follow their words. They may speak of Jesus but don't want to go to the cross with Jesus.
The Gospel gets down in the mess of human existence. It gets into the genuine pain and suffering of the world. It faces the impossible problems we encounter, calling them what they are. Salvation is why Jesus has come, and it will take Him to the cross where all the broken mess of humanity is redeemed.
The Gospel speaks the truth about sin, death, and the devil. The Gospel speaks the truth about Jesus that He and He alone is the Way, the Truth, and the Life.