To be able to rise from the earth; to be able, from a station in outer space, to see the relationship of the planet earth to other planets; to be able to contemplate the billions of factors in precise and beautiful combination that make human existence possible; to be able to dwell on an encounter of the human brain and spirit with the universe

The Celebration of Life: A Dialogue on Hope, Spirit, and the Immortality of the Soul (ed. Bantam, 1991)