It is the destiny of man to journey from humanity to Divinity. In this pilgrimage, he is bound to encounter various obstacles and trials. In order to illumine the path and help him overcome these troubles, sages, seers, realized souls, Divine personalities and Incarnations of God take birth in human form. They move among the afflicted and the seekers who have lost their way or strayed into the desert, and lead them into confidence and courage. Certain personalities are born and live out their days for this very purpose.
(SSS Vol XIV - Chap 16)