Dr. Luther on suffering in our vocations:

I ask where our suffering is to be found. I shall soon tell you: Run through all stations of life, from the lowest to the highest, and you will find what you are looking for.

We are not to look for a cross, the devil and world will make one for us.

Simply live as an earnest Christian, preacher, pastor, burgher, farmer, noble, lord, and fulfill your office faithfully and loyally. Let the devil worry where he can find a piece of wood out of which to make a cross for you, and the world where it can find a branch out of which to make a scourge for your hide.

Quoted in Wingren, Luther on Vocation, pp29f