We see this in little kids. They ask, "Why?" over and over. And if it they are older eventually you might even say, "Because I said so."
Sometimes God says that to us too, "Because I said so."
This week I painted over a painting I painted back in 2013. Why? I don't know why. I guess I don't need to know why. I call the painting, Two Fairies. My youngest daughter asked me what I was going to do with it. I told I didn't know. Presently it sits on a high shelf just because.