Life

When you were born, smiles are always on your face. You don't have to worry about anything in life.
When you are a child. School, games, nature all become your childhood experiences.
When you are mature, you have to think about your occupation, you career, where you wish to work for, what you do to be successful and many other things.
Then, when you grow old, when you are retired, you may think about what have passed by and look forward to the rest of your life. Thinking.
And what comes will come, you may go to heaven.