The Earth reminded us of a Christmas tree ornament hanging in the blackness of space. As we got farther and farther away it diminished in size. Finally it shrank to the size of a marble, the most beautiful marble you can imagine. That beautiful, warm, living object looked so fragile, so delicate, that if you touched it with a finger it would crumble and fall apart. Seeing this has to change a man, has to make a man appreciate the creation of God and the love of God.

In Kevin W. Kelley The Home Planet, with Plate 38; as quoted by C.C. Gaither & Alma E Cavazos-Gaither (2003). Astronomically Speaking: A Dictionary of Quotations on Astronomy and Physics. p. 262. CRC Press. ISBN: 9781420034677