Silence is the best Upadesa [spiritual instruction], but it is suited only for advanced pupils; others are unable to draw full inspiration from it, therefore they used words to explain the Truth. But Truth is beyond words. It does not admit of explanation. Lectures may entertain individuals for a few hours without having an effect upon them, whereas the result of silence is permanent and benefits all. Even though it is not understood, that does not matter. Oral lectures are not so eloquent as silence. It is unceasing eloquence. The primal master Dakshinamurti is the ideal and he taught in silence.
~ Sri Ramana Maharshi