Bhagavad Gita 6.37
Arjuna asked: What of him who fails to control himself, whose mind falls from spiritual contemplation, yet retains his faith and does not attain perfection?
अर्जुन उवाच
अयतिः श्रद्धयोपेतो योगाच्चलितमानसः।
अप्राप्य योगसंसिद्धिं कां गतिं कृष्ण गच्छति॥arjuna uvāca
ayatiḥ śraddhayopeto yogāccalitamānasaḥ|
aprāpya yogasaṃsiddhiṃ kāṃ gatiṃ kṛṣṇa gacchati||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).