Among weapons I am the thunderbolt; among cows I am the wish-fulfilling cow called Kamadhenu; I am the progenitor, the god of love; among serpents I am Vasuki.
In simple words
Krishna continues: "Among weapons, I am the thunderbolt. Among cows, I am the divine cow Kamadhenu who grants every wish. Among the forces of creation, I am desire — the god of love. Among serpents, I am Vasuki."
Word-by-word meanings
आयुधानम्among weaponsअहम्Iवज्रम्the thunderboltधेनूनाम्among cowsअस्मि(I) amकामधुक्kamadhenu the heavenly cow which yiedls all desiresप्रजनःthe progenitroचandअस्मि(I) amकन्दर्पःKandarpa (Kamadeva)सर्पाणाम्among serpentsअस्मि(I) amवासुकिःVasuki
10.28 आयुधानम् among weapons? अहम् I? वज्रम् the thunderbolt? धेनूनाम् among cows? अस्मि (I) am? कामधुक् kamadhenu? the heavenly cow which yiedls all desires? प्रजनः the progenitro? च and? अस्मि (I) am? कन्दर्पः Kandarpa (Kamadeva)? सर्पाणाम् among serpents? अस्मि (I) am? वासुकिः Vasuki.Commentary Vajram the thunderbolt weapon made of the bones of Dadhichi an implement of warfare which can only be handled by Indra who has fininshed a hundred sacrifices.Kamadhuk The cow Kamadhenu of the great sage Vasishtha which yielded all the desired objects? also born of the ocean of milk.Kandarpa Cupid.Vasuki The Lord of hoodless or ordinary serpents.Sarpa (serpent) has only one head. Vasuki is yellowcoloured. Nagas have many heads. Ananta is firecoloured.Sridhara says that the Sarpa is poisonous and the Naga is nonpoisonous. Sri Ramanuja says that Sarpa has only one head and Naga has many heads.
Contemporary scholarly and practical interpretations for modern seekers.
This interpretation draws on a specific tradition and may not represent the view of any single school. For authoritative guidance within a specific tradition, seek a qualified teacher.
Modern
Among weapons, I am the thunderbolt. Among the celestial weapons, the supreme thunderbolt is infallible. There was once a demon named Vritra who would repeatedly assault the heavens and disturb their peace. Through his tremendous power, he had become invulnerable. At that time, a great sage and ascetic named Dadhichi offered his very bones to create a divine weapon for his destruction. With this weapon fashioned from his bones, Vritra was slain.
Among cattle, I am Kamadhenu, the wish-fulfilling cow. Kamadhenu was obtained from the churning of the cosmic ocean. It is believed to be a unique cow through which all our desires can be fulfilled.
Among the causes of creation, I am Kamadeva, the god of desire. According to Indian understanding, the deity of desire is Kandarpa—Kamadeva, Madan—depicted as a youthful, well-formed figure. This god of desire wounds each of the five senses of human beings with his five flower-tipped arrows from the bow of his gentle smile. This relates to a truth of biology. The creation of progeny should not be understood merely as the act of conception or the watering process in the plant kingdom. According to Indian philosophy of desire, it means the satisfaction of all those sensual inclinations that are expressed through all the senses. A true philosopher is a true scientist, and therefore lacks that false shame or hesitation which hypocritical moralists—naturally unethical yet outwardly rigid in their morality—typically possess. The teachers of Vedanta analyze desire with the same clinical detachment as a professor in a medical college.
The Lord declares: Among all the causes of creation, I am Kandarpa. In the realm of worldly enjoyment, Kamadeva represents the complete satisfaction of a person's physical, mental, and intellectual nature.
Among serpents, I am Vasuki. According to the descriptions in the Puranas, Vasuki is coiled around the finger of Lord Shiva. Though this serpent is small enough to take the form of Shiva's ring, it is employed as a rope in the churning of the cosmic ocean. Naturally, the word Vasuki recalls that teaching from the Upanishads which states that the Atman is subtler than the atom and greater than the greatest thing. Therefore, it is fitting that among serpents, Vasuki is declared to be the manifestation of the Lord.
There is a distinction between a serpent and a serpent-king. A serpent has a single hood, while a serpent-king has many hoods.
The divine singer of the Gita continues to reveal his glorious manifestations in his beautiful melody.