You can't... they would need to experience first hand nothing short of a miracle... anything else we'll just file under yet unexplainable scientific events...
the holy spirit draws .. you can plant water or harvest ... you probably can't do all 4 ..so the pressure is off of you .. if it were up to you alone we should all be worried ... it pleased god that men preaching would man be saved .... listen to the voice of the shepard and forsake it not
you are in the wrong state of mind, i am god, and i command you to cease your incoherent sentences corrupt mortal, lest you be consumed by lies and misguided further. you will make nice fodder for the flora.
Not your place, my friend. All you can do is be a living testimony of love and grace, and be a witness to the truth of God, rightly divided. The rest is up to the individual.....