Mental growth is never ending. You continue to learn for your entire life. To live a happy, meaningful life, you must have success in the mental field. The best thing you can do for yourself is to explore your mental self. Avoid the superficial things in life, such as houses and money, and focus on being the primary force behind your mental efforts. Allow spirituality to seep into your mentality. Be independent, and let your mind wander alone.
Think for yourself, and ignore the ideas and rules set by the common conformist society. Expand your personal identity at all possible times. You are truly at your best when self reliant. The more independent you become, the better you are. Base your thoughts and actions upon your own beliefs, not others. As Emerson said, "Conformity is the death of individualism.".