6 And now, I, Moroni, would speak somewhat concerning these things; I would show unto the world that faith is things which are hoped for and not seen; wherefore, dispute not because ye see not, for ye receive no witness until after the trial of your faith.This scripture is very important for an investigator (and everyone else) to understand. Because, a lot of people here, before we even get anything out, just after walking up to them will say, "No, thank you." and continue on their way. But the things that we know is that, yes, this gospel is true, it will help your life, and though you can't see God or anything right now, if you'd just give us an opportunity to share! Then you could begin to develop your faith, and you could begin to receive a witness. I guess the hardest thing for me to come to terms with as a missionary is that, we know that if people will just try doing the three things, Church, Pray, Read, they can know for themselves that it's true! The only problem is getting people to start.
In the MTC, one of my teachers told us, "You must have the faith that if they do these three things, they will know for sure that it's true. If they have done these and they don't know, something is missing or they've done one of them wrong." That's the faith they, and we all must have, because it's true.