The life of the believer will be different from the life of the unbeliever.
There will be transformation into the image of Christ in the life of the believer (he will not be perfect, and there will be differing levels of maturity, but his trajectory will be towards Christ).
John Calvin said it this way:”
He whose life differs not from that of unbelievers, has learned nothing of Christ; for the knowledge of Christ cannot be separated from the mortification of the flesh.
Words of Grace 