In this context 'drul pa is brda' rnying for 'grul pa, "to move, go, wander (towards some destination)". See Btsan lha ngag dbang tshul khrims, Brda dkrol gser gyi me long, p. 369. Matthew Kapstein Numata Professor of Buddhist Studies The Divinity School of the University of Chicago Directeur d'études Ecole Pratique des Hautes Etudes, Paris