“He who has a why to live for can bear almost any how.”
The Purpose of Life Isn’t to Be Happy
Zat Rana

This is the second time I’m coming across this quote today (the first was from Sapiens: A Brief History of Humankind). I think this this is the summary of living a life of purpose. It doesn’t matter what you have to go through to achieve your why, because in the end it will be worth it.