Longing for what?
Days gone by? That may or may not have been so great.
Or a future of greatness? That may or may not come true.
Too much of the first brings on depression of things you cannot change.
Too much of the second brings on anxiety of things you cannot control.
You need to let go of who you were so that you can become who you want to be.
Longing is not a bad thing. It can be the driver to make your life better.
It can be the driver to create the goals that move you forward in life.
Long to be better each day. Long to be more humble. Long to be more empathetic. Long to be more wise. Long to be more understanding.
“Waste no more time arguing what a good man should be, be one.” -Marcus Aurelius, Meditations, X.16
Focus on making your life better, by being better. Not on external factors that you cannot control.
“There is only one way to happiness and that is to cease worrying about things that are beyond the power of our will.” – Epictetus, Enchidrion, 1