Speaking with understanding means imagining a definite state while knowing exactly what you are doing, and it is worth more than any amount of noise made without it. The unknown tongue is prayer offered blindly, ten thousand words poured out at a god somewhere else. It moves nothing, because the speaker does not grasp that his own imagination is the power addressed. Such words teach no one.
Five words spoken with understanding are the short, felt claim that you already are the person you want to be. That is imagining from the end, knowing the creative power is your own awareness. The church, the assembly of awakened states within, is instructed by such speech because a definite assumption, held and felt, shapes the whole inner company. A person governs his world by what he understands himself to be, not by how much he says.