Bhagavad Gita 18.64सर्वगुह्यतमं भूयः श्रृणु मे परमं वचः।इष्टोऽसि मे दृढमिति ततो वक्ष्यामि ते हितम् ॥

Now listen once more with rapt attention to My words. Thou art very dear to Me. Thou art a sincere aspirant. Therefore I am telling thee this most mysterious truth. Hear from Me this mystery of all mysteries. I shall tell it to you again to make a deep impression on your mind, although it has been declared more than once. I do not hope to get any reward from thee. Thou art My most beloved friend and disciple. Therefore I will speak what is good for thee, the means of attaining Selfrealisation. This is the supreme good or the highest of all kinds of good for thee.