Pure Thoughts and Worship

May all my thoughts be pleasing to him, for I rejoice in the LORD. [Psalm 104.34]

There is no doubt a need to be pure in thought.

How does one become pure in thought?

Is there a clue in this verse?

Does 'rejoicing in God' have anything to do with purity of thought in the minds of worshipers? It would appear so.

Father, I want to worship You. I want to rejoice in You. I want to glorify You and You alone.