"You cannot teach a man anything; you can help him to find it within himself."
  — Galileo

And what Tagore says about the teacher is also quite striking: "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."

We all know that Nature teaches more than she preaches. The same thing holds good in Tagore's life. He taught us not only more but much more than he actually preached.