Jamieson, Fausset & Brown, on 1Cor 15:14

“And if Christ be not risen again, then is our preaching vain, and your faith is also vain.”

“your faith . . . vain-- (Co1 15:11). The Greek for "vain" here is, empty, unreal: in Co1 15:17, on the other hand, it is, without use, frustrated. The principal argument of the first preachers in support of Christianity was that God had raised Christ from the dead (Act 1:22; Act 2:32; Act 4:10, Act 4:33; Act 13:37; Rom 1:4). If this fact were false, the faith built on it must be false too.”

Imported from an open dataset — not yet checked against the printed edition.