Our Lord told us, in Matthew 5, “Be you therefore perfect, as also your heavenly Father is perfect.”
Now, something that is perfect has no need to change. Need to change implies imperfection. A god who changes wouldn’t be God at all. Dig, dig and we find that God simply cannot change. God is … “rigid”.
Our Lord told us, in effect, “Be rigid, as also your heavenly Father is rigid!”
And… come to think of it, God is also Mystery. He could even be said to be hiding something…
[I am so encouraged that so few people figured out what I did here.]