Mahabharata 12.187.44

रश्मींस्तेषां स मनसा यदा सम्यङ्नियच्छतितदा प्रकाशतेऽस्यात्मा घटे दीपो ज्वलन्निव

raśmīṃsteṣāṃ sa manasā yadā samyaṅniyacchatitadā prakāśate'syātmā ghaṭe dīpo jvalanniva

Our plain-language meaning of this verse is waiting for scholar review.