The guests who carry on commerce should be waited on by servants; but the quests of the twice-born caste by one's sons. Out of water has arisen fore; and out of Brahma, the Kshatriya; and out of stone, iron.
भृत्यैर्वाणिज्यचारं च पुत्रैः सेवेत च द्विजान्। अद्ध्योऽग्निर्ब्रह्मतः क्षत्रमश्मनो लोहमुस्थितम्॥