During the journey, the scholar asked the ferryman, with obvious pride and mockery, if he knew anything about grammar and the rules of language.
The ferryman simply replied, "I don't."
"Alas!" retorted the rude scholar of grammar, "You have wasted half of your life."
At this, the sailor was terribly hurt and aggrieved. But he kept quiet. Suddenly the boat was extremely nervous in the high waves and gushing water. "Do you know how to swim, learned Sir?" asked the sailor.
"No!" said the scholar.
The ferryman remarked, "Alas! You have wasted your whole life for the boat is sure to capsize in a few minutes."
Moral: Knowledge in one branch is not enough to be proud about.