चातुर्वर्ण्यं मया सृष्टं गुणकर्मविभागशः | तस्य कर्तारमपि मां विद्ध्यकर्तारमव्ययम् ||
Chatur varnyam maya srishtam
The four social divisions were created by Me based on qualities and actions.
Modern Application: Roles are based on qualities, not birth.
Deep Wisdom: Krishna explains social structure based on nature and actions.