Answer:
Yes. This sentence must be added.
Step-by-step explanation:
The above sentence shows a personal experience of the author of the letter and shows his ability to reason and choose, showing that he has an active and reflective brain, that he has the ability to analyze and that he does not act with emotion in the domain, but rather as the reason. This sentence, in a way, has the ability to present the author of the letter and illustrate his personality and identity.