Surely I cannot look at thee, like unto the sun risen, and of immeasurable (power), and irrepressible, and resembling the mountain Mainaka. O hero, to-day this wonder of my heart is very great, that thou remaining by his side, Rama should have encountered Ravana personally. Depending on the strength of thy arms, thou wert capable of instantly destroying Lanka, with its warriors, and horses, elephants and chariots.

In plain words: Bhima says he cannot look at Hanuman, who shines like the rising sun. He wonders why Rama had to fight Ravana himself, since Hanuman alone could have destroyed Lanka and its whole army.