Bhagavatapurana 12.2.4

12.2.4

liṅgaṃ evāśrama-khyātāv anyonyāpatti-kāraṇam /
avṛttyā nyāya-daurbalyaṃ pāṇḍitye cāpalaṃ vacaḥ //

4. Only the external marks will distinguish the particular asrama or order, or lead to changing from one order to another or to paying respects to each other when they meet; through poverty justice becomes weak and to pour out words will be the mark of scholarliness.