The goal of life is a secret mystery, no one knows it, but everyone wishes to know it. No one knows the exact goal of life. 

Does the person have a definite goal in life? 

The secret of the purpose or goal of life, whatever it is, is hidden inside and is not revealed.  After knowing a lot, we come to know that the goal of life is to know ourselves. By knowing this secret of knowing ourselves, we come to know that knowing God is the ultimate goal.

Secret is kept inside.

Why is it not clear what the goal of life is? Has someone hidden it?