O best among the twice-born, it is therefore concluded that the highest perfection one can achieve by discharging the duties prescribed for one’s own occupation according to caste divisions and orders of life is to please the Personality of Godhead.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
अतः पुम्भिर्द्विजश्रेष्ठा वर्णाश्रमविभागशः । स्वनुष्ठितस्य धर्मस्य संसिद्धिर्हरितोषणम्
ataḥ pumbhirdvijaśreṣṭhā varṇāśramavibhāgaśaḥ | svanuṣṭhitasya dharmasya saṃsiddhirharitoṣaṇam
SB 1.2.13