Here’s a call to worship which references all three persons of the Trinity. It would be especially appropriate for use on Trinity Sunday (the first Sunday after Pentecost).
Call to Worship
To God be all glory,
the One who visits us in three persons,
the Holy Trinity of hope and love.
For there is no place which is without you, O God,
and no time when you are not there.
For you are the beginning and the end,
the source of all that is
in the wonder of universal life.
And yet, you take us by the hand and lead us,
as the life of Christ walks our human way
and shows us that life is stronger than death.
In the Holy Spirit, we are gifted, again and again,
and are called onwards toward a future
in which we are surrounded with love and grace,
We praise and worship you, O God,
for there is no other God like you.
— from Words for Worship. Posted on the http://pilgrimwr.unitingchurch.org.au/ website.