The net

One day a David asked his wife to go to the market and buy a mosquito net. His wife went to a shop and asked the shopkeeper to show her the best quality net. The shopkeeper showing her a very good net said, "this is the best quality which you won't be able to find elsewhere. Not even a single. Mosquito can pass through it." Mr. David refused to but the net. When the shopkeeper asked the reason, she said, " if a mosquito can't pass through it, then how will we pass through it." Then she returned home and narrated the whole matter to her husband.