Take up one idea. Make that one idea your life - think of it, dream of it, live on that idea. Let the brain, muscles, nerves, every part of your body, be full of that idea, and just leave every other idea alone. This is the way to success.
We begin from the recognition that all beings cherish happiness and do not want suffering. It then becomes both morally wrong and pragmatically unwise to pursue only one's own happiness oblivious to the feelings and aspirations of all others who surround us as members of the same human family. The wiser course is to think of others when pursuing our own happiness.
I don't know whether the universe, with its countless galaxies, stars and planets, has a deeper meaning or not, but at the very least, it is clear that we humans who live on this earth face the task of making a happy life for ourselves. Therefore, it is important to discover what will bring about the greatest degree of happiness.