The third duty of a teacher is that he should not withhold from his students any advice. After he finishes the outward sciences, he should teach them… - Al-Ghazali

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The third duty of a teacher is that he should not withhold from his students any advice. After he finishes the outward sciences, he should teach them the inward sciences. He should tell them that the object of education is to gain nearness of God, not power or richness and that God created ambition as a means of perpetuating knowledge which is essential for these sciences.