Many astronauts have talked about the experience of looking at Earth from space, and a cognitive shift that has been called the Overview Effect. There is a great video that highlights this effect. It features one of my childhood heroes, Edgar Mitchell who died a few months ago. If you have 19 minutes to enrich your life, please take the time now, and enjoy!(full screen viewing recommended)

OVERVIEW from Planetary Collective on Vimeo.

This Wikipedia article has more information.

There is one being. Our sense of separation from everything else is a thought created illusion. It doesn't exist. Our experiences of individuality, with a personal mind, personal awareness, personal thinking, identification with the body, and sense of self importance all fall away. They're sentient. Life itself is held within a greater context of being. That context shows us the folly of our quests to dominate, manipulate and control nature.