“In my youth I had three teachers:sanctuaries, temples, and monasteries.In my adulthood I had three professors:knowledge, wisdom, and understanding. In my youth I had three teachers:truth, intellect, and intuition.In my adulthood I had three professors:practice, discipline, and willpower. In my youth I had three teachers:conscience, reality, and experience.In my adulthood I had three professors:pain, hardship, and tragedies. In my youth I had three teachers:the past, the present, and the future.In my adulthood I had three professors:the world, the heavens, and the universe. In my youth I had three teachers:friends, enemies, and books.In my adulthood I had three professors:God, nature, and life.”