Be not many of you teachers. The evil referred to is that where many desired to be teachers, though but few could be qualified for the office, and though, in fact, comparatively few were required. Prohibition with mh and present middle imperative of ginomai. There is thus a clear complaint that too many of the Jewish Christians were attempting to teach what they did not clearly comprehend. This soon became an acute question, as one can see in I Cor.
Teachers are necessary, but incompetent and unworthy ones do much harm.
The reason is obvious. The pretence of knowledge adds to the teacher's responsibility and condemnation. For we often stumble and fall, all of us. If there is any one who never stumbles in speech, that man has reached maturity of character and is able to curb his whole nature. We all offend.