Sai Baba lived in Shirdi for about sixty years and during this long period, He did the business of grinding almost every day - not, however, the wheat alone; but the sins, the mental and physical afflictions and the miseries of His innumerable devotees. The two stones of His mill consisted of Karma and Bhakti, the former being the lower and the latter the upper one. The handle with which Baba worked the mill consisted of Jnana.