Henri J. M. Nouwen
There is no such thing as the right place, the right job, the right calling or ministry. I can be happy or unhappy in all situations. I am sure of it, because I have been. I have felt distraught and joyful in situations of abundance as well as poverty, in situations of popularity and anonymity, in situations of success and failure. The difference was never based on the situation itself, but always on my state of mind and heart. When I knew I was walking with God, I always felt happy and at peace. When I was entangled in my own complaints and emotional needs, I always felt restless and divided.
Source: Seeking Peace