Canto 1 - Boyhood
Bāla-kāṇḍa
Chapter 64: Viśvāmitra Falls Prey to Anger
Text 1.64.18

बभूवास्य मनश्चिन्ता तपोऽपहरणे कृते॥

babhūvāsya manaś-cintā tapo-’paharaṇe kṛte

babhūva asya = he; manaḥ-cintā = resolved as follows; tapaḥ-apaharaṇe kṛte = when his austerity had [thus] been stolen.

When his austerity had [thus] been stolen, he resolved as follows.