The crossing of space ... may do much to turn men's minds outwards and away from their present tribal squabbles. In this sense, the rocket, far from being one of the destroyers of civilisation, may provide the safety-value that is needed to preserve it.
Arthur C. ClarkeThe realisation that our small planet is only one of many worlds gives mankind the perspective it needs to realise sooner that our own world belongs to all its creatures.
Arthur C. ClarkeThe phenomenon of UFO doesn't say anything about the presence of intelligence in space. It just shows how rare it is here on the earth.
Arthur C. Clarke