不管白猫黑猫，捉住老鼠就是好猫 bùguǎnbáimāohēimāo, zhuōzhùlǎoshǔjiùshìhǎomāo pragmatism
it doesn't matter whether a cat is white or black; as long as it catches mice it's a good cat (Deng Xiaoping's famous saying favoring pragmatism over ideological purity)