Arjuna was a Brahmacharin and an observer of vows. Having secured that almost unattainable weapon, he had tiever used it even when put into the greatest of difficulties.
ब्रह्मचारी व्रती चापि दुरवापमवाप्य तत्। परमव्यसनार्तोऽपि नार्जुनोऽस्त्रं व्यमुञ्चत॥