In this quote, Pierre Corneille is suggesting that preserving a lie requires an excellent memory. This suggests that in order to successfully trick somebody, one need to have a strong ability to keep in mind information and keep an eye on the story they have actually made. This might be due to the fact that lies typically need a complicated web of incorrect information, and any slip-ups or disparities might lead to the fact being revealed. For that reason, Corneille is highlighting the importance of having a sharp memory in order to maintain a lie and prevent being caught. This quote works as a cautionary pointer that lies can be hard to sustain and might ultimately decipher if one's memory is not up to the job.
