"Nobody has a magic lamp which can tell you in advance whether what you say will be effective in persuading an audience."

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A teacher can never truly teach unless he is still learning himself. A lamp can never light another lamp unless it continues to burn its own flame. The teacher who has come to the end of his subject, who has no living traffic with his knowledge but merely repeats his lesson to his students, can only load their minds, he cannot quicken them.

— Rabindranath Tagore