THE MAN BORN BLIND
THERE was a man born blind, and he said: “I do not believe in the world of light and appearance. There are no colors, bright or somber. There is no sun, no moon, no stars. No one has witnessed these things.” His friends remonstrated with him, but he clung to his opinion: “What you say that you see,” he objected, “are illusions. If colors existed I should be able to touch them. They have no substance and are not real. Everything real has weight, but I feel no weight where you see colors.”
A physician was called to see the blind man. He mixed four simples, and when he applied them to the cataract of the blind man the gray film melted, and his eyes acquired the faculty of sight. The Tathagata is the physician, the cataract is the illusion of the thought “I am,” and the four simples are the four noble truths.
BUDDHA, THE GOSPEL By Paul Carus
Chicago, The Open Court Publishing Company,[1894]
https://www.sacred-texts.com/bud/btg/btg65.htm
The Four Noble Truths comprise the essence of Buddha’s teachings, though they leave much left unexplained. They are the truth of suffering, the truth of the cause of suffering, the truth of the end of suffering, and the truth of the path that leads to the end of suffering.
The Fourth Noble truth charts the method for attaining the end of suffering, known to Buddhists as the Noble Eightfold Path. The steps of the Noble Eightfold Path are Right Understanding, Right Thought, Right Speech, Right Action, Right Livelihood, Right Effort, Right Mindfulness and Right Concentration. Moreover, there are three themes into which the Path is divided: good moral conduct (Understanding, Thought, Speech); meditation and mental development (Action, Livelihood, Effort), and wisdom or insight (Mindfulness and Concentration).
https://www.pbs.org/edens/thailand/buddhism.htm