Varna (Societal Class)

Let's see how the societies are divided into 4 societal classes (varnas).

I created the 4 classes based on natural tendencies and/or innate actions.

चातुर्वर्ण्यं मया सृष्टं गुणकर्मविभागशः ।
तस्य कर्तारमपि मां विद्ध्यकर्तारमव्ययम् ॥४:१३॥

Lord Krishna says to Arjun:
Four divisions were created by me according to the characteristics and actions of them as the doers. Know me as an inexhaustible non-doer, though.

The four classes are distinguished based on their innate actions.

ब्राह्मणक्षत्रियविशां शूद्राणां च परन्तप ।
कर्माणि प्रविभक्तानि स्वभावप्रभवैर्गुणैः ॥१८:४१॥

Lord Krishna says to Arjun:
Braahman, Kshetriya, Vaishya and Shudra are, O subduer of enemies (O Arjun) distinguished by characters of their own natural actions born of the (three) characteristics.

Self-restrain, austerity, honesty, knowledge, piety etc are the actions pertaining to Braahmans.

शमो दमस्तपः शौचं क्षान्तिरार्जवमेव च ।
ज्ञानं विज्ञानमास्तिक्यं ब्रह्मकर्म स्वभावजम् ॥१८:४२॥

Lord Krishna says to Arjun:
Tranquility, self-restraint, austerity, purity, endurance, honesty, knowledge, comprehension and piety are the actions, born of their own nature, of the Braahmans.

Valor, agility, perseverence, charities etc are the Kshetriya actions.

शौर्यं तेजो धृतिर्दाक्ष्यं युद्धे चाप्यपलायनम् ।
दानमीश्वरभावश्च क्षात्रं कर्म स्वभावजम् ॥१८:४३॥

Lord Krishna says to Arjun:
Valor, agility, perseverance, dexterity and not absconding from the battle, charities, and disposition to the god are the actions, born of their own characters, of the Kshetriyas.

Agriculture and commerce are actions of Vaishyas while service and dispatch are actions of Shoodras.

कृषिगोरक्षवाणिज्यं वैश्यकर्म स्वभावजम् ।
परिचर्यात्मकं कर्म शूद्रस्यापि स्वभावजम् ॥१८:४४॥

Lord Krishna says to Arjun:
Farming, cow-protection, commerce are the actions born of the Vaishya nature. Also, service is the action born of the Shoodra nature.

Dying performing own's duties, even imperfectly, is better than performing others' duties perfectly.

श्रेयान्स्वधर्मौ विगुणः परधार्मात्स्वनुष्ठितात्।
स्वधर्मे निधनं श्रेयं परधर्मो भयावहः ॥३:३५॥

Lord Krishna says to Arjun:
Performing one's own imperfect duties is better than doing other's duties well. Death in performing one's own duties is better than performing other's formidable duties.