since bad things happen in our life, we can know what is good and what is bad for us and can select the one who really care for us.
Good has the positive attitude because bad is existing.
We know the value of love only when we missed it.
We know the feel of love only when lust overflows.
We know the warmth of caring only when we experienced uncaring.
We can identify the selfless only when we suffered from selfish.
We can identify pure love only when we suffered from a cheating attitude.
We can know the value of tasty and tidy food only when we experienced un delicious food.