Truth is not only absolute fairness, but also means unanimous consensus, which lies herein as the key that truly drives social progress today. Although every truth must have absoluteness and immutability, and does not exist in reality, and belongs to the category of metaphysics, it has continuity with relevant objective things in reality, and its intrinsic mechanism is inertia. Based on this, I initially created the "Trialism on things' limits", which resolved the dilemma that truth had no place to reside in dualism and could only be passed over ambiguously, and expanded the philosophical view of materialism to the category of metaphysics. The major social systems in the world today all aim for fairness as their goal pursued. Among them, the obedience of the minority to the majority constitutes the main body of the dualistic social system, and its flaw lies in imposing the consensus of part of the people on others. And the social system defined by Trialism is based on dualism to add unanimous consensus as a third aspect, and a unity of opposites is formed by virtue of the absoluteness of truth together with the democracy and centralism in reality. With the reasonable return of methodology from dualism to Trialism, war can hardly begin because ambiguity disappears. The higher the proportion of consensus, the higher the productive forces. As a result, we can more reasonably and efficiently do that "concentrate on accomplishing major tasks" in a long-term peaceful environment to escort the pursuit of a better life for humanity.