One day , a young man goes to an old man. The old man is _ and he knows everything. He looks up into the old man's eyes and says, "I know you're a very wise man. I'd like to know the secret of life." The old man looks at the young man and answers, "I am thinking about that all my life. The secret is four words. The first word is think .Think about what you want to get from life. The second is believe. Believe in yourself, and don't care too much about what other people say. Just do your best. The third is dream. Dream about the things you love. Hold on to your dream, and never give up when you meet difficulties. The last is dare. Dare to make your dream come true. " The young man nods  his head and leaves happily. What's the passage mainly about?
Meet different kinds of difficulties. Hold on to your dream . Believe in yourself. The secret of life