Sunday School–Week Three–The Holy Trinity


“The mystery of the Most Holy Trinity is the central mystery of Christian faith and life.”

“It is the mystery of God in himself.”

Source: Catechism of the Catholic Church


For Parents to Teach to Their Children

Holy, Holy, Holy Blessed Trinity

1 Holy, holy, holy! Lord God Almighty!
Early in the morning our song shall rise to thee;
holy, holy, holy! merciful and mighty,
God in three persons, blessed Trinity!

Our Prayers

“The Apostles’ Creed” is a profession of our faith and is a prayer. It states the basic beliefs of the Catholic Church. 

“The Glory Be” Prayer

This prayer gives all glory and praise to God. It is a simple prayer that children can learn easily and they can cross themselves when they pray it, out loud, or privately in their hearts.

“Glory Be”

“Glory be to the Father,

and to the Son,

and to the Holy Spirit.

As it was in the beginning,

is now,

and will be forever. Amen”

Source: The Catholic Children’s Bible “Catholic Prayers” Page1992

The Catholic Children’s Bible

Readings for Grown-Ups

Source: The Catechism of the Catholic Church


“The Trinity is One. We do not confess three Gods, but one God in three persons, the ‘consubstantial Trinity’.83 The divine persons do not share the one divinity among themselves but each of them is God whole and entire: ‘The Father is that which the Son is, the Son that which the Father is, the Father and the Son that which the Holy Spirit is, i.e. by nature one God.'”84

“By calling God ‘Father’, the language of faith indicates two main things: that God is the first origin of everything and transcendent authority; and that he is at the same time goodness and loving care for all his children. God’s parental tenderness can also be expressed by the image of motherhood,62 which emphasizes God’s immanence, the intimacy between Creator and creature. The language of faith thus draws on the human experience of parents, who are in a way the first representatives of God for man. But this experience also tells us that human parents are fallible and can disfigure the face of fatherhood and motherhood. We ought therefore to recall that God transcends the human distinction between the sexes. He is neither man nor woman: he is God. He also transcends human fatherhood and motherhood, although he is their origin and standard:63 no one is father as God is Father.”

“Jesus revealed that God is Father in an unheard-of sense: he is Father not only in being Creator; he is eternally Father in relation to his only Son, who is eternally Son only in relation to his Father: ‘No one knows the Son except the Father, and no one knows the Father except the Son and any one to whom the Son chooses to reveal him.'”64

“For this reason the apostles confess Jesus to be the Word: ‘In the beginning was the Word, and the Word was with God, and the Word was God’; as ‘the image of the invisible God’; as the ‘radiance of the glory of God and the very stamp of his nature'”.65″

“Before his Passover, Jesus announced the sending of ‘another Paraclete’ (Advocate), the Holy Spirit. At work since creation, having previously ‘spoken through the prophets’, the Spirit will now be with and in the disciples, to teach them and guide them ‘into all the truth’.68 The Holy Spirit is thus revealed as another divine person with Jesus and the Father.”

Readings for Children

An Excerpt from MagnifiKid! May 27, 2018 The Most Holy Trinity

Parents, please read this to younger children, explaining as you go. It’s an excellent explanation of a complex mystery!

“A Mystery” By Lisa Reno, Page 3 Vol. 15. Part 6. Section 5

“In God, three persons have for ever loved each other perfectly. First, there is God the almighty Father, creator of the visible and invisible universe. Then, there is Jesus his only Son, true God and true man, who came down from heaven to save us. Third, the Father and the Son give us God the Holy Spirit, the divine love that makes us holy. Thanks to Jesus, our human intelligence can better understand the mystery of the Holy Trinity: a single God in three persons.”

“Christians are baptized in the name of the Father and of the Son and of the Holy Spirit.”

Source: COMPENDIUM Catechism of the Catholic Church


“There is only one God.” Page 15

“In God there are three Persons–the Father, The Son, and the Holy Spirit.” Page 15

“The Father is the First Person. The Son is the Second Person. The Holy Spirit is the third Person. There are three Persons in ONE God.” Page 15

“We PICTURE God the Father as a kind father. But he is really a Spirit. We cannot see a spirit. It is easy to PICTURE God the Son because He really became a man. We PICTURE God the Holy Spirit as a dove. But He too is really a Spirit. We also call Him the Holy Ghost.” Page 16

“All three PERSONS are equal.” Page 16

“We know that there are three Persons in one God because we have God’s word for it.” Page 17

“The Father sent His Son to us on earth. The Son told us what the Blessed Trinity is like.” Page 17

“The Blessed Trinity is God’s Family. But it is a family which is all one God.” Page 17

First Communion Catechism

Our Writing Project

We remember information better if we write it down. Taking notes in class may now be more commonly done on a computer or other electronic device. But, actually writing new words or important dates, etc. is the way the brain and hand interact to help our memory. There is so much to learn in Sunday School–prayers, stories, songs, gestures and responses–that your child will benefit from having their own prayer notebook.

Click here for an idea about making a journal to keep important information.

On the back of the watercolor paper to be used for the art project, invite your child to write,

“In the name of the Father, and of the Son, and of the Holy Spirit.”

I recommend using colored pencils so that there is no color visible on the side that will be drawn on.

Older children can write,

“The Father is God.

The Son is God.

The Holy Spirit is God.

All THREE persons are ONE God.

We call them the BLESSED TRINITY.”

Source: The New Saint Joseph First Communion Catechism  Page 16

Our Art Project

Invite your child to use watercolor pastels, crayons, chalk pastels, or children’s oil pastels to draw or trace a cross on the piece of watercolor paper mentioned above. They can use watercolors to paint this project, as well.

I used water soluble pastels to draw symbols of God the Father’s creation of the world from “Genesis”-the sun, plants, water, and a rainbow (from “Noah’s Ark”) –at the top and bottom of the cross. The cross itself is a symbol of God the Son, Jesus Christ. Children might want to draw a simple heart as a symbol of their love for Jesus, or they can draw the Sacred Heart of Jesus, with the cross at the top of the heart and the “radiance” around the heart. God the Holy Spirit has several symbols. I used the symbol of flames from the “tongues of fire” of the Holy Spirit at Pentecost. The dove is also a symbol of the Holy Spirit, but it is harder to draw. If using  pastels, have your child use his or her finger to smear the pastel for a smooth effect.

Our Materials

Suggested Homework Activities

Invite your family members to do a good deed for others this week at home and at school. Perhaps they can sweep up litter on their block, or ask to help the teacher with a simple job, such as emptying the class trash can.

“Do for others what you want them to do for you.” (Matthew 7:12)

Please read with your child: “Noah’s Ark” in Genesis ” chapter 7:1-24 from your family Bible or a Catholic Children’s Bible. Click on the link to the story from the





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