The major social systems in the world today all aim for fairness as their pursued goal. Whether Western or Eastern democracy, the obedience of the minority to the majority is a common rule for both. The flaw lies in imposing the consensus of part of the people on others. And truth is absolute fairness, meaning unanimous consensus, which lies herein as the key that truly drives social progress today. Although 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. This means that the communist social system is based on the current democratic systems (which belong to dualism) both in the East and the West 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, ambiguity breeds chaos whereas consensus harbors peace. This is a new connotation provided for how to implement the community with a shared future for mankind on the basis of theoretical innovation.