it doesn't matter whether a cat is white or black; as long as it catches mice it's a good cat (variant of a Sichuanese saying used in a speech by Deng Xiaoping 鄧小平|邓小平[Deng4 Xiao3 ping2] in 1962, usually associated with his economic reforms starting in 1978, in which pragmatism was favored over ideological purity)