Because it is contextual to chapter three.
FYI, No one wrote the letters in the Bible with chapters and verses or in King James English. That was all added.
That is why it is essential to read before and after a verse, sentence, chapter, and book so that you can understand the author's intent.
- Who was he writing to?
- What time frame was it written in
- how did they apply it, then
- and how do we apply it today