What Dryden achieved in his poetry was neither the emotional excitement of the early nineteenth-century romantics nor the intellectual complexities of the metaphysicals. His subject matter was often factual, and he aimed at expressing his thoughts in the most precise and concentrated manner. Although he uses formal structures such as heroic couplets, he tried to recreate the natural rhythm of speech, and he knew that different subjects need different kinds of verse. In his preface to Religio Laici he says that "the expressions of a poem designed purely for instruction ought to be plain and natural, yet majestic... The florid, elevated and figurative way is for the passions; for (these) are begotten in the soul by showing the objects out of their true proportion.... A man is to be cheated into passion, but to be reasoned into truth.