1 Chronicles 23:30 - "to stand every morning to thank and praise the LORD, & likewise at even;" - The next generation of Levites were being placed & part of their "job" was to praise God. They were to stand & praise in the morning & in the evening. There were times they did not feel like praising God, yet, they did. We may not "be in the mood to praise God", but no matter; He is still worthy of our thanksgiving.