Christ lives. I know that. Through living prophets, He has restored His church to the earth. Along with that church were restored some of Christ's "plain and precious" doctrines that were lost to the world (1 Nephi 13:40). These were not lost all at once but over time, after God's priesthood authority was lost. One of these deals with obedience. Obedience is key to fulfilling God's purposes. God knows what will make us happy and he gives us commandments to help us. He gives us these commandments through prophets (See Amos 3:7). When we follow the commandments we see the blessings God has promised us and we please our Father in Heaven.
I know obedience is essential to fulfilling God's will for us. I know He loves us and gives us commandments for a reason. I beleive the words of Christ when He said "If ye love me, keep my commandments" (John 14:15).