Mystery of faith

"The mystery of the Most Holy Trinity
is the central mystery of Christian faith and life."
Cathechism of the Catholic Church No. 234

SOLEMNITY OF THE MOST HOLY TRINITY

Christians are baptized in the name
of the Father and of the Son and of the Holy Spirit;
not in their names,
for there is only one God,
the almighty Father,
his only Son,
and the Holy Spirit:
the Most Holy Trinity.

Catechism of the Catholic Church No. 233

"Strive to preserve the unity of the spirit
through the bond of peace:
one body and one Spirit,
as you were also called
to the one hope of your call;
one Lord, one faith, one baptism;
one God and Father of all,
who is over all
and through all
and in all."

Ephesians 4:3-6