I cannot overemphasize the importance of good grammar.
What a crock! I could easily overemphasize the importance of good grammar. For example, I could say, "Bad grammar is the leading cause of slow, painful death in North America" or "Without good grammar, the United States would have lost World War II."
A grammarian fell into a well one day and had difficulty climbing up the slippery sides.
A little later, Nasruddin chanced by and heard the man's cries for succor. In the casual language of everyday life, he 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 Nasruddin. "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.