There are three mysteries in the world. The air to the birds, the water to the fish and man to himself. Fish aren’t aware of water; it’s what they swim in all the time. So they don’t even think about it. The same with the birds and the air. It’s their normal environment. And this is how for us, our very own beliefs are! We swim and fly in them all the time, so much so that they are typically invisible to us.