The Lord is The Word.
So Paul is telling us to rejoice in "The Word" always.
Here are examples of The Word in which we can rejoice always.
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Philippians 4:19 But my God shall supply all your need according to HIS riches in glory by Christ Jesus.
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Psalm 23
2 HE maketh me to lie down in green pastures: HE leadeth me beside the still waters.
3 HE restoreth my soul: HE leadeth me in the paths of righteousness for HIS name's sake.
4 Yea, though I walk through the valley of the shadow of death, I will fear no evil: for THOU art with me; THY rod and THY staff they comfort me.
5 THOU preparest a table before me in the presence of mine enemies: THOU anointest my head with oil; my cup runneth over.
6 Surely goodness and mercy shall follow me all the days of my life: and I will dwell in the house of the LORD for ever.
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God turns sorrow into joy as we think on HIS Word which HE has given to us.
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