Repeat from last year:
Don't fall into the error of modalism--that at different points of history, God appeared in different forms. That is, God was Father during the Old Testament times, then became the visible Son, then at Pentecost became manifest as the Spirit.
The lectionary choice of Psalm 104 for Pentecost Sunday reminds us that God as Spirit was present at creation. Verses 24 through 28 cite examples of what God as created--the earth, ships, Leviathan.
These created things need the Spirit:
When you hide your face, they are dismayed; when you take away their breath, they die and return to their dust.
When you send forth your spirit, they are created; and you renew the face of the ground (29-30).
We have been through Lent and through Eastertide. In the church calendar, we are now entering what is called Ordinary Time. We, in the Scriptures and in our lives, have seen and will seen pain and blessings. Verses 33-34 will be a good prayer for us this week and weeks to come:
I will sing to the Lord as long as I live;
I will sing praise to my God while I have being.
May my meditation be pleasing to him, for I rejoice in the Lord.
Bless the Lord, O my soul.
Praise the Lord!