In the previous 3 chapters Lord Krishna had explained the knowledge of His energies. In chapter Ten, Krishna explains His opulence more explicitly and reveals Himself as the Supreme God and the source of all.
Krishna proclaims Himself to be the original Supreme Person and explains how one can attain the highest devotional perfection of association with the Supreme Lord.
Krishna is the supreme personality of godhead, the ultimate abode, the purest & absolute truth. He is eternal, transcendental and the original person and his opulence is limitless.
On Arjuna's request Lord Krishna gives a slight indication about His infinite opulence and reveals His Universal Form.
"Among seasons I am spring, among rivers I am the Ganges, among beasts I am the lion, among men I am the King...."
Thus Chapter Eleven begins with Arjuna's request to see the form by which the Lord pervades the universe. Krishna describes that form to Arjuna and then blesses him with eyes to see it. Arjuna, on seeing the Lord's Universal form is completely astonished and folds his hands and begins to offer prayers.
Krishna, while exhibiting His universal form, says that He is time and has come to destroy all. Therefore, Arjuna should not be disturbed and should act as an instrument by fighting.
The lord goes on to declare that only by devotional service can one understand and see Him. Still in doubt Arjuna asks Krishna for His final word on which is best; 'devotional service to the Lord' or 'worship of the impersonal Brahman?'
Krishna reiterates single-minded devotion as the highest form of worship to attain Krishna Consciousness. The practice of single-minded devotion to Sri Krishna, the Supreme Person, stands supreme above all other paths. The Progressive Stages of Devotion are: the practice of fixing the mind on Krishna; working for Krishna; offering the results of ones work to Krishna and meditation or the cultivation of knowledge
The Lord concludes saying that those who follow the devotional path making Him the supreme goal of life, are especially dear to Him. The practice of single-minded devotion to Sri Krishna, the Supreme Person, stands supreme above all other paths.