Good friends know everything about each other. Nothing is secret, nothing is sacred, nothing is held back. As Goodman and O'Brien write, they even knew each other's shoe sizes, not to mention what each other looked like in a bathing suit in February. I can call a friend, no matter what mood I'm in, and be accepted for who I am. Not only when I'm in the best of moods, but also when I'm in a nasty mood.
Friends accept friends, and friends' moods, unconditionally.
That's what friendship is like with God. Whether we're on top of everything in our lives, or feeling completely at odds with the whole world, God accepts us just as we are. Happy or mad, full of ourselves or full of doubt. With a true friend, it doesn't matter whether we live in the same town, or half a world away. It doesn't matter if we talk every day, or just a few times a year.