Only the dreamer shall understand realities, though in truth his dreaming must be not out of proportion to his waking.

The remark contrasts two modes of knowing: the “dreamer,” who imagines possibilities beyond the given, and the merely “waking” mind, which may mistake surface facts for the whole of reality. Fuller suggests that imaginative vision can disclose deeper truths—moral, psychological, or social—that literal-minded realism misses. Yet she adds an important check: dreaming must remain proportionate to waking life. In other words, vision should be disciplined by experience, observation, and practical engagement, so that imagination becomes a tool for insight rather than escapism. The line captures a central Transcendentalist tension Fuller often explored: the need to unite aspiration and idealism with grounded action in the world.