The Western Three Saints in Buddhism are three important figures in the Pure Land school of Mahayana Buddhism. They are:
Amitabha Buddha - the principal figure of Pure Land Buddhism, who is venerated as the Buddha of Infinite Light and Life.
Avalokitesvara Bodhisattva (also known as Guanyin Bodhisattva) - the Bodhisattva of Compassion who is venerated for his/her role in helping sentient beings.
Mahasthamaprapta Bodhisattva - the Bodhisattva of Great Strength, who represents the power of wisdom and strength on the path to enlightenment.
Together, these three figures are known as the Western Three Saints or the Three Pure Land Sages. They are regarded as objects of devotion and veneration in Pure Land Buddhism, which emphasizes rebirth in Amitabha's Pure Land as a means of achieving enlightenment.
Devotion to the Three Saints is thought to have several functions, including:
Purification: Practitioners believe that devotion to the Three Saints can help purify their minds and hearts, by focusing their attention on the qualities of infinite light, boundless life, great compassion, and wisdom.
Accumulation of Merit: Devotion to the Three Saints is also thought to help practitioners accumulate good karma or merit, which is believed to be necessary for rebirth in the Western Pure Land.
Protection: The Three Saints are also seen as powerful protectors who can help practitioners overcome obstacles and challenges on their spiritual path.
Inspiration: The Three Saints are regarded as spiritual exemplars whose qualities of compassion, wisdom, and strength can inspire and guide practitioners in their own spiritual practice. Overall, the function of the Western Three Saints is to provide a focus for devotion and inspiration, as well as a means of spiritual purification and accumulation of merit, all with the ultimate goal of achieving rebirth in the Western Pure Land and attaining enlightenment.