arvak-downwards; srotah-passage of food; tu-but; navamah-the ninth; ksattah-O Vidura; eka-vidhah-one species; nrnam-of human beings; rajah-the mode of passion; adhikah-very prominent; karma-parah-interested in working; duhkhe-in misery; ca-but; sukha-happiness; maninah-thinking.