The third of the four sights which influenced the Buddha and compelled him to seek a means to enlightenment was death. More specifically, witnessing a dead corpse. Living a sheltered life, he was unaware of death and that nobody could escape it.
Siddhartha was disappointed and discouraged. He was often found in deep contemplation in his room after seeing the diseased man. Suddhodhana was pitiful after seeing him so changed. The prince soon approached him again for his consent to leave the castle to witness more things about the life in the city. Suddhodhana knew there would come no good by attempting to stop his child. So, he agreed to let him go again.
Siddhartha and Channa went out from the royal residence and strolled in many parts of Kapilvastu dressed as young aristocrats. The prince saw a group of people tagging along the road crying, while four men at the back were bearing a board on which a thin man lay level and still. The carried man resembled a stone, never letting out the slightest breath. The group soon ceased and the board bearers rested the man down on a heap of wood and set the wood ablaze. The man did not move as the flares were consuming the board, and afterward his body, from all sides.
Siddhartha asked Channa about it. He wondered why that man was burned like that. Channa answered that the man had died. The prince learned that everybody dies, even rulers, and nothing can stop death.
The prince was stunned. He thought about death and how it comes to everybody, sparing nobody. Was there no real way to stop it? He went home quiet. He went straight to his own room in the royal residence and sat somewhere down in thought for the remaining day.