Bhagavad Gita Chapter 11.54
bhaktyā tv ananyayā śakya
aham evaḿ-vidho ’rjuna
jñātuḿ draṣṭuḿ ca tattvena
praveṣṭuḿ ca paran-tapa
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.