The four sights are four things described in the legendary account of Gautama Buddha's life which led to his realization of the impermanence and ultimate dissatisfactoriness of conditioned existence. According to this legend, before these encounters Siddhārtha Gautama had been confined to his palace by his father, who feared that he would become an ascetic if he came into contact with sufferings of life according to a prediction. However, on his first venture out of the palace with his charioteer Channa, he observed four sights: an old man, a sick man, a corpse and an ascetic. These observations affected him deeply and made him realize the sufferings of all beings, and compelled him to begin his spiritual journey as a wandering ascetic, which eventually led to his enlightenment. The spiritual feeling of urgency experienced by Siddhārtha Gautama is referred to as saṃvega.
After the birth of the Prince Siddhārtha, King Śuddhodana called upon eight Brahmins to predict his only son's future. While seven of them declared that the prince would either be a Buddha or a great King, the Brahmin Kaundinya was confident that he would renounce the world and become a Buddha.
Śuddhodana, who was determined that his son should be a great king, confined the prince within the palace and surrounded him with earthly pleasures and luxury, thereby concealing the realities of life that may encourage him to renounce these pleasures and become an ascetic.
After leading a sheltered existence surrounded by luxury and pleasure in his younger years, Prince Siddhārtha ventured out of his palace for the first time at the age of 29. He set off from the palace to the city in a chariot, accompanied by his charioteer Channa (Sanskrit: Chandaka).
On this journey he first saw an old man, revealing to Siddhārtha the consequences of aging. When the prince asked about this person, Channa replied that aging was something that happened to all beings .
The second sight was of a sick person suffering from a disease. Once again, the prince was surprised at the sight, and Channa explained that all beings are subject to disease and pain. This further troubled the mind of the prince that none can stay healthy and live a pain free life.