PURPORT

In the Bhagwat Geeta it is said that Brahmayoti or the glowing effulgence transcendental is resting on Lord Shri Krishna. In other words the glowing effulgence known as Brahma Teja is nothing but rays of the Lord as much as the sun rays are to the sun disc. So this Brahma weapon also, although materially it is irresistible without any check still the Lord being Supreme nothing could surpass His strength. The weapon of the name Brahmastra released by Aswathama was neutralised and foiled by Lord Shri Krishna by His own energy that is to say He did not wait for any other's help in any case because He is Absolute.