Orson Pratt,
Journal of Discourses — Volume 18…
“ You know it by virtue of your obedience to the message; you have done the will of the Father, and you have realized the fulfillment of the promise; so that it is not a matter of guesswork, of mere opinion; you know beyond a single doubt that it is the work of the living God. Suppose an impostor was to undertake to preach this Gospel, offering the same promises to believers, which of course would not be fulfilled. Do you not therefore see that it would be impossible to gather such people together from the different nations? ”
