I've been a little hesitant to join the discussion on this one mainly because I was a little concerned about where this was heading. Early in my Christian experience, I attended a nondenominational evangelical church (arminian) that embraced the teaching of the "Victorious Christian Living" movement. The congregation was instructed that if they were truly Christian, they would necessarily bear the joy of the Lord and this was to be evidenced by a smiling face. What I saw were smiling faces with a deadness in their eyes and spirit. The joy of the Lord was indeed taught but could not be replicated by these unbelievers. This was most disturbing to me.

The joy of the Lord cannot be feigned. Apart from the saving knowledge of God, one cannot truly say that "the joy of the Lord is my strength" for it does not belong to an unbeliever or as Pilgrim pointed out, to temporary believers. One can certainly rouse emotions and call them joy, yes even strong emotions and call them joy. These feelings may indeed be their only experience of anything like joy. But the believer who trusts in the Lord, the Lord is his strength and he is endowed with joy. It is the tried and true believer who enduring the various trials of faith knows unwavering that his Redeemer liveth. This is the source of the believer's joy. The Christian needs to focus his attention on Christ and then he may know His benefits.
Psalms 37:4 "Delight thyself also in Jehovah; And he will give thee the desires of thy heart."

The Chestnut Mare