Bhagwad Gita
Chapter 11, Verse 54
भक्त्या त्वनन्यया शक्यमहमेवंविधोऽर्जुन।
ज्ञातुं दृष्टुं च तत्त्वेन प्रवेष्टुं च परंतप।।11.54।।
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.