Answer: Bradford claims that he is only writing down "an instance or two and omit the rest," meaning he will only describe the most important events.
Explanation:
Bradford explains that while the departure into Holland, many problems were encountered, including betrayels and ambushes, so many that he couldn´t recollect them all. So he will only describe the most important ones.
A person's thoughts and conscious reactions to events, perceived as a continuous flow. a literary style in which a character's thoughts, feelings, and reactions are depicted in a continuous flow uninterrupted by objective description or conventional dialogue.
It is a phrase that is commonly said and it doesn’t compare any two things, so it is an idiom.