Jazālat al-alfāẓ is dignified, strong diction fitted to the intended meaning. Ease and sweetness of composition describe the natural relationship among words, without the impression that the text has been forced into a particular rhyme or ornamental pattern.
Unnecessary strain can obscure the sense and weaken the address. The account of Qur’anic eloquence therefore joins elevated expression with fluency and well-judged concision.
Two questions: Is the chosen word appropriate to its setting? Does the construction communicate the meaning naturally, or burden it with artificial complexity? Both help evaluate the combined literary effect.