Does a Christian Need to be Happy-Go-Lucky to Glorify Christ?

When a Christian is down because of real life circumstances, should it be expected of him to be joyous?

Some of the thoughts that I was pondering caused me to listen to this sermon on being sorrowful and yet rejoicing. I loved that John Piper touched on this question in my mind, “Does a Christian need to be happy-go-lucky to glorify Christ?”

“…as sorrowful, yet always rejoicing…” 2 Corinthians 6:10

http://www.desiringgod.org/sermons/sorrowful-yet-always-rejoicing