sri bhagavan-the Supreme Personality of Godhead; uvaca-said; vettha-just know from Me; idam-this; drona-putrasya-of the son of Drona; brahmam astram-hymns of the brahma (nuclear) weapon; pradarsitam-exhibited; na-not; eva-even; asau-he; veda-know it; samharam-retraction; prana-badhe-extinction of life; upasthithe-being imminent.