The Vedic philosophy explains this variety in a more scientific manner.

[SanskAI]

The Vedic philosophy explains this variety in a more scientific manner. It states that the material energy is constituted of three guṇas (modes):
sattva guṇa (mode of goodness), rajo guṇa (mode of passion), and tamo guṇa (mode of ignorance).

• The Brahmins are those who have a preponderance of the mode of goodness. They are predisposed toward teaching and worship.
• The Kshatriyas are those who have a preponderance of the mode of passion mixed with a smaller amount of the mode of goodness. They are inclined toward administration and management.
• The Vaishyas are those who possess the mode of passion mixed with some mode of ignorance. Accordingly, they form the business and agricultural class.
• The Shudras are those who are predominated by the mode of ignorance. They form the working class.

This classification was neither meant to be according to birth, nor was it unchangeable. Shree Krishna explains in this verse that the classification of the Varṇāśhram system was according to people’s qualities and activities.

Although God is the creator of the scheme of the world, yet he is the non-doer. This is similar to the rain. Just as rain water falls equally on the forest, yet from some seeds huge banyan trees sprout, from other seeds beautiful flowers bloom, and from some thorny bushes emerge. The rain, which is impartial, is not answerable for this difference. In the same way, God provides the souls with the energy to act, but they are free in determining what they wish to do with it; God is not responsible for their actions.