Srimad Bhagavadgita Sadhaka Sanjivani -Swami Ramsukhdas
In the sixteenth verse of the tenth chapter, Arjuna requested Lord Krsna to describe in full, His divine glories. In response to his question, Lord Krsna while describing His divine glories, in the beginning and at the end, told him that there was no end to His divine glories (10/19,40). So, He gave only a brief description. But, here Arjuna requests Him to show him His divine form (only one), but Lord Krsna says to him, "Behold in hundreds and thousands, My multifarious divine forms" (11/5). As in this mortal world, if a greedy person demands a lot, from a donor, he gets only a little; but if he demands a little hesitatingly, the donor gives more. Similarly, first Arjuna requested the Lord to describe His divine glories in detail, so He described in brief. But, here Arjuna becomes cautious and hesitatingly prays to Lord Krsna, to reveal that form to him, if He deems it fit. The Lord, is influenced by this hesitating mood and asks him to behold His multifarious divine form, in hundreds and thousands.