For every word has its marrow in the English tongue for order and for delight.

Smart’s line praises English as a language whose words carry an inner “marrow”—a nourishing core of meaning and expressive power. The phrase suggests that diction is not merely decorative: each word, properly chosen, has substance that can sustain both “order” (clarity, structure, reasoned arrangement) and “delight” (music, wit, pleasure). Read this way, the quote aligns with an 18th‑century concern for balancing correctness with imaginative richness: language should discipline thought while also giving sensuous enjoyment. It also implies a moral or intellectual duty in writing—mining the full resources of English so that expression is at once precise and pleasurable.