*28 Q. Are the three Divine Persons equal in all things?
A. The three Divine Persons are equal in all things.

29 Q. Are the three Divine Persons one and the same God?
A. The three Divine Persons are one and the same God, having one and the
same divine nature and substance.

Though they are one and the same, we sometimes attribute different works
to them. For example, works of creation we attribute to God the Father;
works of mercy to God the Son; and works of love and sanctification to
the Holy Ghost; and you will often find them thus spoken of in pious
books; but all such works are done by all the Persons of the Trinity;
because such works are the works of God, and there is but one God.

*30 Q. Can we fully understand how the three Divine Persons are one and
the same God?
A. We cannot fully understand how the three Divine Persons are one and
the same God, because this is a mystery.

"Fully"--entirely. We can partly understand it. We know what one God is
and we know what three persons are; but how these two things go together
is the part we do not understand--the mystery.

*31 Q. What is a mystery?
A. A mystery is a truth which we cannot fully understand.

"A truth," that is, a revealed truth--one made known to us by God or His
Church. It is a truth which we must believe though we cannot understand
it. Let us take an example. When a boy goes to school he is taught that