法華玄義釋籤 1.32

1.32

次明開者，指實為權、權掩於實，名方便門閉；今指權為實、於權見實，名方便門開。「示」謂指示，示其見實之處，故云也。

Next, clarifying "opening": pointing to the real as provisional, with the provisional concealing the real, is called the gate of skillful means being closed; now, pointing to the provisional as real, and seeing the real within the provisional, is called the gate of skillful means being opened. "Showing" means pointing out; it points to the place where they see the real, hence it is said.