catur-varnyam maya srstam
catur-varnyam-the four divisions of human society; maya-by Me; srstam-created; guna-quality; karma-work; vibhagasah-in terms of division; tasya-of that; kartaram-the father; api-although; mam-Me; viddhi-you may know; akartaram-as the non-doer; avyayam-being unchangeable.