A student approached the head monk in a Zen monastery to ask how he could alleviate his suffering. The monk simply responded, "If you can breathe in... you can breathe out." -Ancient Oral Anecdote
I love this little story so much. I think it's very true. Everything passes at some point. Learning to let things go is a skill. Emotions are energy. Happiness, anger, hate, love, frustration, compassion, exhilaration, joy, hurt, the list goes on and on. When you hold on to those negative ones, the hate, or the anger, you are holding on to bad energy inside yourself. Where it will fester and grow. Learning to let it go and breathe through things will give a sense of peace with in yourself. It takes practice though. Every day.
Just like the monk said, "Breathe in... breathe out."