Faith.

Now faith is the substance of things hoped for, the evidence of things not seen (Hebrews 11:1).  It all starts with that faith Paul is talking about.  Faith is the first principle of the Gospel of Jesus Christ.  In order to gain a greater faith in Jesus Christ, we must follow his teachings.  We can look at a cake all day long, however, until we experiment, or in other words, we try the cake we wont know if it tastes good.  The same concept applies to Jesus Chirst.  Until we actually try keeping the commandments and see the great things that come from it, we wont be able to gain a great faith in him.  We can do it through keeping any commandment he has given us.  For each and every commandment we follow we are promised by God certain blessings. "There is a law, irrevocably decreed in heaven before the foundations of this world, upon which all blessings are predicated—And when we obtain any blessing from God, it is by obedience to that law upon which it is predicated (Doctrine and Covenants 130:20-21)."
  So Faith is something that needs to be acted upon to see the results.  If we keep the commandements we will be able to see the blessings those decisions have brought.  Faith is gained through actively seeking it.  I testify of these things.  I know these things are true.  I have tried the experiment and Planted the seed of Faith in my heart.  I try to nurture it, and give it things that will help it grow.  Reading my Scriptures, Praying, going to church, boy these things sound like things God commands us to do don't they?  Keep the commandments and your faith will grow.  I Promise you that. I love you all.  Gain that Faith!!! 

                                    http://new.lds.org/study/topics/faith?lang=eng