A grammarian fell into a well one day and had difficulty climbing up the slippery sides.
A little later, a Sufi chanced by and heard the man’s cries for succor. In the casual language of everyday life, the Sufi offered aid.
The grammarian replied, “I would certainly appreciate your help. But by the way, you have committed an error in your speech,” which the grammarian proceeded to specify.
“A good point,” acknowledged the Sufi. “I had best go off awhile and try to improve my skills.” And so he did, leaving the grammarian at the bottom of the well.