Having knowledge is not sufficient for happiness or salvation. In life you are given a puzzle to solve. You have forever to solve it. When you do, you become like God. However, you have a problem—you don’t have the ability to solve the puzzle alone.
Are you free?
Freedom is knowing the truth. The truth will set you free (John 8:32). Free from what? Free from mortality and free to live an exalted life.
What is truth? Truth is knowledge of things as they are, as they were, and as they are to come (D&C 93:24).