In all of Paul’s other letters, after greeting his audience he either gives thanks or prays for them, but not here! The matter is urgent and arresting: there is no other gospel than the one he had already preached. The sole ground of our salvation is good news of Jesus’ death and resurrection. We have to know what it is and cling to it for spiritual life, and Paul writes to them, and for us, so we can know how to love others in the same way.