Bhagavad Gita 10.16वक्तुमर्हस्यशेषेण दिव्या ह्यात्मविभूतयः।याभिर्विभूतिभिर्लोकानिमांस्त्वं व्याप्य तिष्ठसि ॥

In this verse it appears that Arjuna is already satisfied with his understanding of the Supreme Personality of Godhead, Kṛṣṇa. By Kṛṣṇa’s grace, Arjuna has personal experience, intelligence and knowledge and whatever else a person may have, and through all these agencies he has understood Kṛṣṇa to be the Supreme Personality of Godhead. For him there is no doubt, yet he is asking Kṛṣṇa to explain His all-pervading nature. People in general and the impersonalists in particular concern themselves mainly with the all-pervading nature of the Supreme. So Arjuna is asking Kṛṣṇa how He exists in His all-pervading aspect through His different energies. One should know that this is being asked by Arjuna on behalf of the common people.