Everything in this life is turn by turn. Although not everything, but the fundamental things in life are.
For example when it is daytime in one part of the world, it is nighttime halfway in another part of the world. When you are experiencing daylight here, another person is experiencing nighttime here. That is why you must not laugh or mock others that are are going through difficult times in their lives.
No ones life is perfect, the journey is short, but road is not smooth. You have to learn empathy. Show empathy for others when they are passing through problems in life because certainly you will also be experiencing ups and downs in life.
When it is your morning don't laugh at others people's night, your own dark time is also coming. Understand the season you are right now know that it won't last forever. You can better today and be bitter tommorow.