श्री भगवानुवाच इदं तु ते गुह्यतमं प्रवक्ष्याम्यनसूयवे। ज्ञानं विज्ञानसहितं यज्ज्ञात्वा मोक्ष्यसेऽशुभात् ॥

idaṁ tu te guhyatamaṁ pravakṣhyāmyanasūyave jñānaṁ vijñāna-sahitaṁ yaj jñātvā mokṣhyase ’śhubhāt

To thee, the uncarping, verily shall I declare this profoundest Secret, wisdom with knowledge combined, which, having known, thou shalt be freed from evil.

In plain words: Krishna tells Arjuna that because he does not find fault or argue, he will share the deepest secret with him. It is wisdom joined with practical knowledge, and knowing it will free Arjuna from evil.