What does the quote He was like a cock who thought the sun had risen to hear him crow means?

The quote "He was like a cock who thought the sun had risen to hear him crow" suggests that someone is overly self-important or egotistical, believing that their actions or presence are the center of attention or significance. It implies a level of arrogance, as if the person believes their contributions alone have caused a particular event or outcome. The imagery of a rooster crowing at dawn highlights the absurdity of such self-delusion.