the most talented in a skill or art will prectise it, so the task of instruction is left to the less talented
Those who can, do. Those who cannot, teach. Those who cannot teach, HACK! To be, or not to be, those are the parameters. google
Of course, Shaw was also the man who coined the immortal line, "Those who can, do;those who cannot, teach". google
"Those who can, do; those who cannot, teach.". —Not many. —Those who can, do; those who can't, bully. Google
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