1 Corinthians 15:1-5:
Now I would remind you, brothers, of the gospel I preached to you, which you received, in which you stand, and by which you are being saved, if you hold fast to the word I preached to you—unless you believed in vain.
For I delivered to you as of first importance what I also received: that Christ died for our sins in accordance with the Scriptures, that he was buried, that he was raised on the third day in accordance with the Scriptures, and that he appeared to Cephas, then to the twelve.
The death and resurrection of Jesus Christ for the salvation of those who trust him is old news. It is really old, really good news. So what are we aiming for in hearing again and again that which we've heard before?
The hope in hearing the old, good news is that it would perpetually break new ground in our lives. Our hearts are like a jungle. There is untamed wilderness and darkness that has not yet been brought, as it were, under the rule of the One who has laid claim to it all.
We need to hear the gospel again and again so that the old, good news of Jesus Christ would reach into these unchartered territoties of our lives and fly the flag of its dominion. This is how we are "being saved." This is what it means to be overcome by the gospel.