The good in the bad
Both good and bad go hand in hand in life. Although it seemed bad at first, later I realized that it was good for us. So life should not be seen only one-sidedly. Even in bad there can be good hidden, if we can find it.
Advantages in spite of difficulties
Sometimes what we consider unfortunate turns out blessing for future. Suppose you applied for a job but didn't get it. It may feel bad at first but later you will realize that you have got a better chance for it. Such incidents have happened in the lives of many famous people. For example Thomas Edison. His teachers said he couldn't learn anything. But it was that bad comment that motivated him to work hard, and that why he became such a great scientist.
Obstacles actually increase strength
If there were no problems in life we would never be strong. Every challenge teaches us something new. Suppose you did not do well in an exam. If you correct the mistakes without getting upset about it then you can do better in the next exam. Difficult situations only increase our patience, morale and skills.
If there was no darkness, I could not understand the light
Bad experiences teach us the value of good things. If we never feel sad then we cannot understand the importance of happiness. If it wasn for the heat I wouldn't have felt the peace of winter. Similarly if I did not taste failure I would not be able to enjoy the joy of success.
A man true form is known only in bad times
When everything is good everyone is around. But when bad times come, you can understand who is truly yours. Friend's identity is in danger. So we need bad times in our life, because it gives us a real idea about the people around us.
When one door closes, another opens
When something is lost in life, it seems like everything is over. But the truth is when one door closes another door opens. Maybe something didn't go according to your plan, but something better is waiting instead. So, even if bad times come, you have to wait patiently without getting frustrated.
This rule is also seen in nature
Even in nature, good is hidden in the midst of evil. When the fire burns the plants to ashes, the ashes later form fertile soil. Flooding in the river causes damage at first, but later it is seen that the land is silted and the crops are better. So nature itself teaches us that there is good in bad.
There will be bad times in life, but you have to find something good out of it. Every bad experience teaches us, changes us and makes us stronger. So there is no need to break down if you feel sad. Life will become easy and beautiful only if you find the good in the bad.