A roller coaster that only went up would be boring.
A song that played the same note over and over would get old.
A friend that says the same thing all the time gets tuned out.
When there is no contrast, no highs and lows, no melodies and harmonies, no color then life falls apart. There is no good times without bad ones. That is why it is best to embrace them all! Feel the bad and know it’s bad. Also know that the bad will not last. Then feel the good and enjoy it because you know it will not last.