Metaphors have a way of holding the most truth in the least space.

Card’s line praises metaphor as a uniquely efficient vehicle for meaning. A metaphor compresses complex, layered experience—emotion, perception, moral judgment, and narrative implication—into a small verbal space by letting one thing stand in for another. The “truth” it holds is not merely factual accuracy but experiential or psychological insight: metaphors can reveal patterns and relationships that literal language struggles to state without becoming long-winded or abstract. The remark also implies a craft lesson for writers: figurative language can concentrate theme and character into memorable images, allowing readers to participate in making meaning by unpacking the comparison.