तस्मात्त्वमुत्तिष्ठ यशो लभस्व
जित्वा शत्रून्भुङ् क्ष्व राज्यं समृद्धम् |
मयैवैते निहता: पूर्वमेव
निमित्तमात्रं भव सव्यसाचिन् || 33||
tasmāt tvam uttiṣhṭha yaśho labhasva
jitvā śhatrūn bhuṅkṣhva rājyaṁ samṛiddham
mayaivaite nihatāḥ pūrvam eva
nimitta-mātraṁ bhava savya-sāchin
tasmāt—therefore; tvam—you; uttiṣhṭha—arise; yaśhaḥ—honor; labhasva—attain; jitvā—conquer; śhatrūn—foes; bhuṅkṣhva—enjoy; rājyam—kingdom; samṛiddham—prosperous; mayā—by me; eva—indeed; ete—these; nihatāḥ—slain; pūrvam—already; eva nimitta-mātram—only an instrument; bhava—become; savya-sāchin—Arjun, the one who can shoot arrows with both hands
Therefore stand up and win glory; conquer your enemies and enjoy an opulent kingdom. By Me and none other have they already been slain; be an instrument only, Ο Arjuna.
Nimittamatram: The Lord commands Arjuna to fight and obtain the Kingdom of glory. But He makes it clear that Arjuna is nothing more than a mere instrument in the inexorable scheme of Time carrying out the will of God by whom all the enemy armies have already been destroyed. (Mayaivaite nihatah purvam eva). The very cause of Arjuna’s grief is the deluded feeling that he is the doer, and that he is to kill his relations and friends.
The Lord now reveals to him that he is not the slayer, but that the Lord in the Cosmic Form of Time, has already destroyed them, and that Arjuna is to be merely an instrument. It is the greatest secret to know that man is not really the doer. The sense of doership is the cause of bondage (ahamkaravimudhātma kartāhamiti manyate 3-27). It is the Lord with His inscrutable power of Maya, that does everything. Knowing this the wise man is not deluded. By giving up the thought of doership, man releases himself from the bondage of Karma and attains the liberated state.
Savyasacin: Arjuna was capable of using the arrows with his left hand also.
Swami Vivekananda Says —
Now what is that good which is to be pursued? The good for him who desires moksha is one, and the good for him who wants dharma is another. This is the great truth which the Lord Shri Krishna, the revealer of the Gita, has tried therein to explain, and upon this great truth is established the varnashrama system and the doctrine of svadharma etc. of the Hindu religion … . “Therefore do thou arise and acquire fame. After conquering thy enemies, enjoy unrivalled dominion; verily, by Myself have they been already slain; be thou merely the instrument, O Savyasachin (Arjuna).” In these and similar passages in the Gita the Lord is showing the way to dharma.[Source])
All the sects and societies that you see, the whole host of them, inside the country or out, he [Sri Ramakrishna] has already swallowed them all, my brother. “These have verily been killed by Myself long ago, be only the instrument, O Arjuna.”[Source]