Cetokhilasutta 5.5

5.5

Yo so, bhikkhave, bhikkhu aññataraṃ devanikāyaṃ paṇidhāya brahmacariyaṃ carati: ‘imināhaṃ sīlena vā vatena vā tapena vā brahmacariyena vā devo vā bhavissāmi devaññataro vā’ti, tassa cittaṃ na namati ātappāya anuyogāya sātaccāya padhānāya.

This being so, their mind doesn’t incline toward keenness, commitment, persistence, and striving.