Bhagavadgeeta Verse 4.13
चातुः वर्ण्यं मया सृष्टं गुणकर्मविभागशः !
तस्या कर्तारम् अपि मां विद्धि अकर्तारं अव्ययम् ॥ ४.१३ ॥
ಚಾತುಃ ವರ್ಣ್ಯಂ ಮಯಾ ಸೃಷ್ಟಂ ಗುಣಕರ್ಮವಿಭಾಗಶಃ !
ತಸ್ಯಾ ಕರ್ತಾರಮ್ ಅಪಿ ಮಾಂ ವಿದ್ಧಿ ಅಕರ್ತಾರಂ ಅವ್ಯಯಮ್ || ೪.೧೩ ||
chAtuH varNyaM mayA sRuShTaM guNakarmavibhAgashaH !
tasyA kartAram api mAM viddhi akartAraM avyayam || 4.13 ||
The cause for gradation in devotion and religious practices lies in God’s own system of creation in consonance with the intrinsic nature and individuality of souls. The individual qualities are natural and eternal; so it is natural that there should be differences in the qualities of aspirants in God’s creation, which is based on a set of facts like intrinsic difference of souls.
Sri Krishna says: The four varnas have been created by Me based upon the proportions of the qualities – satva, rajas & tamas, and tendency for work. Know Me, the unchanging author of that fourfold system, and the one who is without a maker.