Digha Nikaya 1:822
SUJATOAnabhinanditvā appaṭikkositvā tāni padabyañjanāni sādhukaṁ uggahetvā sutte osāretabbāni, vinaye sandassetabbāni.
Instead, having carefully memorized those words and phrases, you should make sure they fit in the discourse and are exhibited in the training.