Two poems may communicate the same judgment by different routes of signification. One may praise directly; another may construct an analogy; a third may imply the idea through metonymic expression.
Theme: the person praised is generous.
Expressive route: a rain-cloud simile, a luminous-lamp image, or a figurative account of helping those in need.
An informed judgment therefore examines not only the conclusion but also the distinctive image and inference through which it is reached.