One must work as a brahmana, ksatriya, vaisya or sudra on the material path. and on the spiritual path, everyone should act as a brahmacari, grhastha, vanaprastha or sannyasi

Expressions researched:
"One must work as a brāhmaṇa, kṣatriya, vaiśya or śūdra on the material path. and on the spiritual path, everyone should act as a brahmacārī, gṛhastha, vānaprastha or sannyāsī"

Srimad-Bhagavatam

SB Canto 5

No one should remain unemployed or unoccupied in any way. One must work as a brāhmaṇa, kṣatriya, vaiśya or śūdra on the material path. and on the spiritual path, everyone should act as a brahmacārī, gṛhastha, vānaprastha or sannyāsī.

SB 5.7.4, Translation and Purport

Mahārāja Bharata was a very learned and experienced king on this earth. He perfectly ruled the citizens, being himself engaged in his own respective duties. Mahārāja Bharata was as affectionate to the citizens as his father and grandfather had been. Keeping them engaged in their occupational duties, he ruled the earth.

It is most important that the chief executive rule the citizens by keeping them fully engaged in their respective occupational duties. Some of the citizens were brāhmaṇas, some were kṣatriyas, and some were vaiśyas and śūdras. It is the duty of the government to see that the citizens act according to these material divisions for their spiritual advancement. No one should remain unemployed or unoccupied in any way. One must work as a brāhmaṇa, kṣatriya, vaiśya or śūdra on the material path. and on the spiritual path, everyone should act as a brahmacārī, gṛhastha, vānaprastha or sannyāsī. Although formerly the government was a monarchy, all the kings were very affectionate toward the citizens, and they strictly kept them engaged in their respective duties. Therefore society was very smoothly conducted.