Peter did not actually use those words, but let's face it, if someone is "always ready to remind you of" something, then they could be working for the prize as chief nagger (is that a real word?)
One has to look carefully at what Peter says in Second Peter starting in verse 12. Although your version of the Bible may divide the first chapter somewhat differently, it still stands as one giant interwoven phrase. With the "if" and "then" and "practice" all tied together in one package.[more]
Add to the "interwoven" aspect, his repeated "I am going to remind you", or "You need to remember" and you have a recipe to stir people's blood. For some, I am sure their blood is boiling about now. Remember, Peter said earlier that our lives as believers is built up step by step. It's not just a "poof!" and you have it. It takes some steps – one at a time or concurrently, but your life as a believer is interwoven with those qualities (see verses 5-7).
Then there is that statement in verse 10, "practice these things" that makes you go back to see what he is talking about. That statement is now underlined in my Bible, because it can only mean one thing – "Look at the list again!" Then the nagging – the stirring us up to action.
What am I missing today? Is it knowing or practicing that makes a difference? Maybe that's why Peter reminds us of those things. Besides, what's the difference between "these things" and "those things?"