I learned these from Adam Curry, inventor of podcasting and former MTV VJ. I use them almost daily (as mantras in my head when dealing with difficult projects and people).
“Wat je zegt ben jezelf, met je kop door de helft.” Loosely translated, it means: What you say about others is who you really are.
“Mierenneuken” Literally translated as: “ant fucking.” This should be a common term in productivity. Nitpicking things that don’t matter, especially within projects that should not exist, is a daily frustration.