In life we experience opposing feelings like happiness & sadness, fear & courage, anger & calmness, disgust & liking, dislike & love, etc. One thing that we sometimes do not realise about opposing feelings is that they are both very important as one can not exist without the other. You know what they say: without experiencing the lows, we would never feel the high.
Let me ask you something: If we would have never felt angry, sad, fearful, disgusted, etc., wouldn't we have lost value of happiness, courage, love, bravery, etc.? Or at the very least would we not have taken them for granted and lost interest in them?