From my 60 years of experience, I learnt that there are always 2 sides to a coin. It is which side we chose to look at that is the most important.
I used to work in a stock firm and was an easily agitated person. Whenever I was in a bad mood, no one would dare to talk to me for the whole day. Colleagues who submit their reports or wish to discuss matters with me would be unfairly criticised and subjected to my rage.
After some time, I realised that most of the time, it is another person over the line, or a matter not involving anyone in the office that got me mad. It was not right of me to scold others like this and I had to learn to control my emotions. So even though it took me a long time, I was able to slowly control my anger and not lose control of my emotions and pour it onto others.
I learnt to see things as a coin, and by choosing to see the truth over my own unhappiness, it helped me to manage my spirit and my interactions with others better.