[narses]

It does seem both certain and authoritative. What other two possibilities do you see and what scripture would support those views?

[Lee N. Field]

What I mean to say is

31. Are the three Divine Persons perfectly equal to one another?

The three Divine Persons are perfectly equal to one another, because all are one and the same God.

I and the Father are one. (John 10:30)

that the quoted scripture only covers the equality of the Father and the Son, not of the Son and Spirit, or Father and Spirit.

I'm not by any means saying it isn't true, just that the provided scripture doesn't cover all the possibilities. This is a catechism, not a systematic theology. Brevity is not surprising.