* Don't send a "quick email", especially during a heated debate.
* Think before you send "reply". Consider how the other party is likely to feel with the content. And, how you would feel if the same text was directed at you. Emotions are important and difficult, especially when you have never met in person.
So I suggest remove the first one as it doesn't really add anything that think before you reply doesn't cover already.
The following two lines are a bit redundant:
So I suggest remove the first one as it doesn't really add anything that think before you reply doesn't cover already.