Bhagavad-gītā 11.54
BG 11.54
Open the full passageभक्त्या त्वनन्यया शक्य अहमेवंविधोऽर्जुन । ज्ञातुं द्रष्टुं च तत्त्वेन प्रवेष्टुं च परन्तप ॥५४॥
Sanskrit
bhaktyā tv ananyayā śakya aham evaṁ-vidho 'rjuna jñātuṁ draṣṭuṁ ca tattvena praveṣṭuṁ ca parantapa
Translation
My dear Arjuna, only by undivided devotional service can I be understood as I am, standing before you, and can thus be seen directly. Only in this way can you enter into the mysteries of My understanding.