Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;

(vain = having no real value - worthless!)

For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;

And that he was buried, and that he rose again the third day according to the scriptures:

He that hath the Son hath life; and he that hath not the Son of God hath not life.