The Buddha and a few disciples happened to pass a lake. Buddha stopped and asked one of his disciples to fetch some water because he was thirsty.
When the disciple reached the water, he noticed some people were washing clothes and a bullock cart was crossing the lake. The water was quite turbid. The disciple thought, “How can I give this muddy water to my Lord!” So he told Buddha the water was unfit to drink.
After a half an hour, Buddha asked the same disciple to return to the lake for some water to drink. The disciple obliged. This time he found the water was absolutely clear. The mud had settled down and the water above it was crystal clear. So he collected water in a pot and brought it to Buddha.
Buddha looked at the water and then up at the disciple. He said, “You let it be and the mud settled down on its own. Your mind is also like that. When it is disturbed, just let it be. Pause. Give it a little time. It will settle down.”