Why must people kneel down to pray? If I really wanted to...

Why must people kneel down to pray? If I really wanted to pray I’ll tell you what I'd do. I'd go out into a great big field all alone or in the deep, deep woods and I'd look up into the sky—up—up—up—into that lovely blue sky that looks as if there was no end to its blueness. And then I'd just feel a prayer.