You can testify because you have received

President George Q. Cannon: “You can testify because you have received—if you live as you should do—a testimony independent of that which we can give to you, or any argument that we may urge—you have received it, if you have received it properly, from our Eternal Father. You received it in answer to prayer, direct to yourselves—not through any intermediate source, not through any man, but through the Eternal Spirit of our Father descending upon you and bearing witness to you—a testimony that these things are true. You, therefore, are living witnesses of the truth of these things, and know for yourselves whether they are true or not.”