Nasreddin decided to buy a new shirt from the best tailor in the town. The tailor measured Nasreddin and then told him, "Come back in a week. At that time, God willing, your shirt will be ready."
Nasreddin waited until a week had passed and then he returned to the tailor's shop. The tailor looked at him apologetically and said, "My dear sir, the shirt is not ready for you yet, but if you return in one week's time, God willing, the shirt will be finished."
Nasreddin was not happy about this delay, but he waited impatiently for another week and then went back to the tailor's shop. The tailor looked at him even more apologetically and said, "I am so sorry, my dear sir, but the shirt is not quite finished. Please come back in three days' time and, God willing, the shirt will be ready."
Nasreddin glared at the tailor, completely exasperated. "How long will it take," he asked, "if you just leave God out of it?"