A Sketch of Truth Theory The Truth Theory refers to a natural attribute which all things embody during cosmic movement. And which features the inherent quality of the universe, that is, the attraction between Yin and Yun, the negative cosmic gas and the positive cosmic gas. It is the natural and scientific reality of the universe. The appearance of this theory will completely shatter the barriers that have hindered human understanding of life and all things in the universe for thousands of years. It will put an end to the idealism-materialism dichotomous outlook on the world and completely terminate the theism-atheism dualistic religious concept that people have disputed for thousands of years. It will enable humankind on Earth to see the universe in the true, clear-minded and correct manner for the first time. It will enable humankind to explain mysterious cosmic phenomena with our acquired part of scientific knowledge about the universe in a deep and complete manner for the first