by which also ye are saved, if ye hold fast the word which I preached unto you, except ye believed in vain.

By which you have salvation; that is to say, the form in which it was given to you, if it is fixed in your minds, and if your faith in it is not without effect.

δια του οποιου και σωζεσθε, τινι τροπω σας εκηρυξα αυτο, αν φυλαττητε αυτο, εκτος εαν επιστευσατε ματαιως.

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