Eckhart Tolle

People tend to dwell more on negative things than on good things. So the mind then becomes obsessed with negative things, with judgments, guilt and anxiety produced by thoughts about the future and so on.

It is only when you watch the dense mass of thousands of ants, crowded together around the Hill, blackening the ground, that you begin to see the whole beast, and now you observe it thinking, planning, calculating. It is an intelligence, a kind of live computer, with crawling bits for its wits.