Vivekachudamani – Miseries of The Unspiritual Man – Verses 6

 vadantu śāstrāṇi yajantu devān

kurvantu karmāṇi bhajantu devatāḥ |
ātmaikyabodhena vināpi muktiḥ
na sidhyati brahmaśatāntare’pi || 6 ||

6. Let people quote the Scriptures and sacrifice to the gods, let them perform rituals and worship the deities, but there is no Liberation without the realisation of one’s identity with the Ātman, no, not even in the lifetime of a hundred Brahmas put together.