This is the third time that Moroni mentions “imperfections” in the record. This time he specifically notes that they might be in either his own or in Mormon’s words. He continues to emphasize, however, that the message is more important than its form. The existence of the Book of Mormon is a greater witness than errors we might find in it. Mormon does not seem preoccupied with the possibility of errors, but it is clearly a theme in Moroni’s writings (Title Page; Morm. 8:12, 17; 9:31, 9:33).
Moroni’s most poignant admonition is “that ye may learn to be more wise than we have been,” an expression of sorrow for his wayward (and now annihilated) people.