Mullah Nasruddin had saved up to buy a new shirt. He went to a tailor's shop, full of excitement. The tailor measured him and said, "Come back in a week, and--if Allah wills--your shirt will be ready."
The Mullah contained himself for a week and then went back to the shop. "There has been a delay. But--if Allah wills--your shirt will be ready tomorrow."
The following day Nasruddin returned. "I am sorry," said the tailor, "But it is not quite finished. Try tomorrow, and--if Allah wills--it will be ready."
"How long will it take," asked the exasperated Nasruddin, "if you leave Allah out of it?"