Aside from Pentecostals, many Christians tend to ignore the Holy Spirit.  And this is not a new phenomenon, since an orthodox doctrine of the Spirit was not fully developed until the late 4th century, clearing the way for a firm articulation of the doctrine of the Trinity.  English Anglican theologian Alister McGrath has, in fact, referred to the Holy Spirit as "the Cinderella of the Trinity". 

A prayerful solution to this oversight, offered in advance of the upcoming Pentecost Sunday, is the following Litany of the Holy Spirit, the effort of Episcopal priest Michael Marsh.   It appears on his estimable site Interrupting the Silence.

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O God the Father, Creator of heaven and earth,
Have mercy upon us.

O God the Son, Redeemer of the world,
Have mercy upon us.

O God the Holy Spirit, Sanctifier of the faithful,
Have mercy upon us.

O holy, blessed, and glorious Trinity, one God,
Have mercy upon us.

Spirit, intercede for us with sighs too deep for words,
Pray for us.

Spirit, intercede for the saints according to the will of God,
Pray for us.

Holy Mary, Mother of God,
Pray for us.

Blessed N. patron of our parish,
Pray for us.

Holy Spirit, who is equal to the Father and the Son,
Keep us in eternal life.

Holy Spirit, who proceeds from the Father,
Enter our hearts.

Holy Spirit, who has spoken through the Prophets,
Open our ears.

Holy Spirit, who enlightens and strengthens for your service,
Dwell in us.

Holy Spirit, who in the beginning moved and brooded over the face of the waters,
Move and brood over our lives.

Holy Spirit, who is God's life-giving breath,
Breathe in us.

Holy Spirit, who blew through the Valley of Dry Bones giving life,
Enliven us.

Holy Spirit, who overshadowed Mary that she might give birth to the Son of God,
Grace us to give birth to the divine in our time and place.

Holy Spirit, who rested on Jesus at his baptism,
Rest upon us and renew our baptismal life.

Holy Spirit, who as a tongue of fire rested on and filled the apostles,
Burn in us with the power of your love.

Holy Spirit, who descended on the day of Pentecost,
Unite us in the confession of one faith.

Holy Spirit, who descended on the day of Pentecost,
Empower us to serve you as a royal priesthood.

Holy Spirit, who descended on the day of Pentecost,
Encourage us to preach the gospel to all nations.

Come Holy Spirit,
Our souls inspire.

Spirit of understanding,
Come.

Spirit of counsel,
Come.

Spirit of fortitude,
Come.

Spirit of knowledge,
Come.

Spirit of piety,
Come.

Spirit of Godly fear,
Come.

With the fruit of love,
Fill us.

With the fruit of joy,
Fill us.

With the fruit of peace,
Fill us.

With the fruit of patience,
Fill us.

With the fruit of generosity,
Fill us.

With the fruit of gentleness,
Fill us.

With the fruit of self-control,
Fill us.

Lamb of God, you take away the sins of the world,
Send us the Advocate.

Lamb of God, you take away the sins of the world,
Send us the Spirit of Truth.

Lamb of God, you take away the sins of the world,
Send us the Holy Spirit.

V:  Come, Holy Spirit, fill the hearts of your faithful,
R:  And kindle in them the fire of your love.

V:  Send forth your Spirit, Lord, and they shall be created,
R:  And you shall renew the face of the earth.

O Heavenly King, Comforter, Spirit of Truth who are present everywhere, filling all things, Treasury of Good and Giver of Life,
Come and dwell in us, cleanse us of every stain, and save our souls, O Good One.

Holy Spirit, you came as Christ own first gift for those who believe, that we might no longer live for ourselves, but for him who died and rose for us:  Complete his work in the world and bring to fulfillment the sanctification of all.  Amen.

Almighty and merciful Lord, Father, Son, and Holy Spirit, bless and keep us, Amen.