Know the Truth of All Things - Moroni 10:4-7

And when ye shall receive these things, I would exhort you that ye would ask God, the Eternal Father, in the name of Christ, if these things are not true; and if ye shall ask with a sincere heart, with real intent, having faith in Christ, he will manifest the truth of it unto you, by the power of the Holy Ghost. And by the power of the Holy Ghost ye may know the truth of all things. And whatsoever thing is good is just and true; wherefore, nothing that is good denieth the Christ, but acknowledgeth that he is. And ye may know that he is, by the power of the Holy Ghost; wherefore I would exhort you that ye deny not the power of God; for he worketh by power, according to the faith of the children of men, the same today and tomorrow, and forever.

 True faith defers to His will in all things. This is of paramount importance. Note the words used: "if ye ask with a sincere heart, with real intent..."

Ye ask, and receive not, because ye ask amiss, that ye may consume it upon your lusts. (James 4:3)

...ask not, that ye may consume it on your lusts, but ask with a firmness unshaken, that ye will yield to no temptation, but that ye will serve the true and living God. (Mormon 9:28)

...all may be benefited that seek or that ask of me, that ask and not for a sign that they may consume it upon their lusts. (D&C 46:9)

What we should not do is approach Him with a non-committal attitude. Such an attitude belies doubt. If you say: "well if I see a miracle, then I'll believe...", it's like saying to your potential fiancée: "I'll love you if you love me first...". It doesn't work like that. In the case of the fiancée, you have to have the love first, otherwise, why would you propose marriage? And yes, our relationship with God is like a marriage, and has been compared to one in scripture.

If we're really sincere, and fully intend to act on whatever knowledge He gives, He answers. As a good parent should, He only reinforces behaviors that lead us in the right direction; in the direction of faith. And when He answers, it is usually through the Holy Ghost - by the power of the Holy Ghost ye may know the truth of all things. 

Jesus said:

I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever; Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you. I will not leave you comfortless: I will come to you. (John 14:16-18)

when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me (John 15:26)

 The Spirit is what testifies of Him and reinforces our faith when our motives are pure.

For he is the same yesterday, today, and forever; and the way is prepared for all men from the foundation of the world, if it so be that they repent and come unto him. For he that diligently seeketh shall find; and the mysteries of God shall be unfolded unto them, by the power of the Holy Ghost, as well in these times as in times of old, and as well in times of old as in times to come; wherefore, the course of the Lord is one eternal round. (2 Nephi 10:18,19)

One last important thing: timing. It is foolish for us to assume that He will grant gifts and answers on our timetable. He does not plan things for our convenience, but for our most good. Sometimes it can be frustrating because we feel we're ready for certain knowledge and blessings now. However, in my experience, when I've insisted on my own timing, things don't go like I had expected. The principle of timing is inherent in this analogy:

The Jews ... despised the words of plainness, ... and sought for things that they could not understand. Wherefore, because of their blindness, which blindness came by looking beyond the mark, they must needs fall; for God hath taken away his plainness from them, and delivered unto them many things which they cannot understand, because they desired it. And because they desired it God hath done it, that they may stumble. (Jacob 4:14)

Sometimes, we insist on things that we're not ready for. And sometimes He gives it to us in part to teach us that His way is the best. Thus we must always defer to His will, even when we feel strongly that something must happen in a certain way or at a certain time. We have to trust Him - this is faith.