In this verse the Lord is addressed as Keśava because He killed the demon Keśī in the beginning of creation. Keśava is also a name of Kṛṣṇa. Kṛṣṇa is the origin of all incarnations, and it is confirmed in Brahma-saṁhitā that Govinda, the Supreme Personality of Godhead, the cause of all causes, exists simultaneously in His different incarnations and expansions. The demon’s attempt to measure the Supreme Personality of Godhead is significant. The demon wanted to embrace Him with his arms, thinking that with his limited arms he could capture the Absolute by material power. He did not know that God is the greatest of the great and the smallest of the small. No one can capture the Supreme Lord or bring Him under his control. But the demoniac person always attempts to measure the length and breadth of the Supreme Lord. By His inconceivable potency the Lord can become the universal form, as explained in Bhagavad-gītā, and at the same time He can remain within the box of His devotees as their worshipable Deity. There are many devotees who keep a statue of the Lord in a small box and carry it with them everywhere; every morning they worship the Lord in the box. The Supreme Lord, Keśava, or the Personality of Godhead, Kṛṣṇa, is not bound by any measurement of our calculation. He can remain with His devotee in any suitable form, yet He is unapproachable by any amount of demoniac activities.