A teacher is not always the one who stands in front of a class or delivers a lecture in an institutional setup. Sometimes, a teacher may not even be a person. Sage Dattātreya spoke of how he gained wisdom from 24 Gurus — among them a pigeon, a moth, the courtesan Pingalā, a child, a maid, an arrow-maker, a snake, a spider, the ocean, the air, the sun, fire, water and many others. His realization was that lessons can come from anywhere.