The placer

The sage and his disciple were sitting near their the table and were silent.

"Look" - the sage began, having scattered the beads on the table: "Here lies a couple of hundred balls, one of them is white, the rest are black, and you easily noticed it, right?"

"Right."

"And if all the balls will be white, will you notice it?"

"Probably no."

"Similarly in life – we usually have around absolutely gray and bad world, full of evil and deceit, but when some happiness appears there, we immediately see it, singl it out, and against the background of small joys, you can sometimes simply miss it away."