Malherbe exercised, or at least indicated the exercise of, a great and enduring effect upon French literature, though not exactly a wholly beneficial one. From the time of Malherbe dates the gradual development of the poetic rules of "Classicism" that would dominate for nearly two centuries until the Romantics. The critical and restraining tendency of Malherbe who preached greater technical perfection, and especially greater simplicity and purity in vocabulary and versification, was a sober correction to the luxuriant importation and innovation of Pierre de Ronsard and La Pléiade, but the lines of praise by Nicolas Boileau-Despréaux beginning "Enfin Malherbe vint" ("Finally Malherbe arrived") are rendered only partially applicable by Boileau's ignorance of older French poetry.