This quote comes from French author Andre Gide and serves as a reminder that getting angry and inciting an argument can often be the worst way to resolve a problem.
It's often tempting to resort to anger, and we often feel like venting will make things better, but it won't. Venting frustrations generally makes your anger worse, so bringing that anger into a conflict isn't going to help matters at all.
Even if you feel like your anger is deserved and you want to use it to make a point, it's almost always better to calm down and approach the situation judiciously. If you think a conversation may lead to a quarrel, step aside and give yourself time to cool off. Few situations are better served by losing your level head.