Pondering my thoughts!

I have a few question concerning this popular unity rule. (See scripture rule below)

1) Am I to be filled with the Spirit before I speak? 2) Or, do I speak and thereby become filled with the Spirit?

“Be filled with the Spirit, speaking to one another with psalms, hymns, and songs from the Spirit. Sing and make music from your heart to the Lord.” – Ephesians 5:18-19 (NIV)