Bab 50: Chapter 45 On the Verge of Death

Just as Sun Wukong was overwhelmed by grief, a rush of excitement and joy emerged from the Void Transcendence Flower that was spinning around Tang Sanzang's body! Yet, the immense sorrow had not dissipated.

Sun Wukong was startled and then his Divine Sense burst forth in its entirety. It all entered Tang Sanzang's body, which was frozen stiff with coldness. Inch by inch, bit by bit, he searched, desperately trying to find a trace of life. Because Sun Wukong believed that the Void Transcendence Flower wouldn't show feelings of surprise and joy for no reason. If it wasn't the Transcendence Flower playing tricks, then it must have detected that Master hadn't entirely perished; there must be a thread of life still present.

So, Sun Wukong had to find that glimmer of hope for life. As long as Master hadn't completely died, he would have the power to bring him back.