Valmiki Ramayana Sundara Kanda Sarga 47 Shloka 9

महाबलः mighty, पार्थिवात्मजः prince, सः he, महात्मनः great self, तस्य कपेः of the monkey, वेगं च and speed, अरिषु at the enemies, पराक्रमं च prowess, स्वम् his, बलं च even strength, विचारयन् judging, हिमक्षये at the end of winter, सूर्य इव like the Sun, अभिवर्धते began to swell up in spirit

Aksha, the mighty prince judging the speed and prowess of the monkey with his own in confronting enemies and the strength of the monkey, began to swell up in spirit like the glow of the Sun at the end of winter.