万变不离其宗
万变不离其宗[wàn biàn bù lí qí zōng]1.■The methods used may vary, but the principle is the same.; change ten thousand times without departing from the original aim or stand; in none of his change has he departed from his stand; in various guises to serve the single purpose (of ...); No matter how many changes one has made, he has not departed from his line.; The central theme remains the same.
