maintain principles with flexibility ? 那位特使～，順利完成了使命。The special envoy maintained principles with flexibility,and completed his mission satisfactorily.
守經達權shǒu jīnɡ dá quán
守：遵守；經：常規(guī)，原則；達：通曉；權：權宜，靈活。指辦事既堅持公道，又能靈活應付。maintain principles with flexibility, hold right principles, but act according to circunstances