Guru Kumhaar Shish kumbh hai, Garhi Garhi kade khot,
andar haath sanhaar de, baahar bahe chot.
Guru is like a Potter and our heads are like the clay mounted on His wheel. Just as the Potter hits the clay on the outside and digs the extra clay and impurities to give it shape from the inside, Guru may be harsh on His children from the outside, but from inside, He loves them and makes them pure.