I remember a story from a church homily. A little girl noticed an old man in her neighborhood who sat on his porch every day just looking out as if waiting for something. She asked him one day what he was looking for. He said he wanted to have a sign of God's existence before he died. The little girl is puzzled by his words, because in her eyes, the whole world around them is proof of God's existence. The flowers, the sun, the singing birds, the beat of her own heart is all the proof she needs.