1Cor.15.2

By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.

1Cor.15.2

and by which your life has been saved. (I'm assuming, now, that your belief was the real thing and not a passing fancy, that you're in this for good and holding fast.)

1Cor.15.2

By this gospel you are saved, if you hold firmly to the word I preached to you. Otherwise, you have believed in vain.

1Cor.15.2

And it is this Good News that saves you if you firmly believe it--unless, of course, you believed something that was never true in the first place.