even a broken clock is right twice a day

Even a broken clock is right twice a day is a phrase for indicating that just because someone has gotten lucky, does not mean they deserve praise and recognition, because it doesnt prove they deserve the reward or recognition they are being given. It is often used when someone becomes successful, not by hard work, but by mere luck. When a clock breaks, it will stay at the time when it broke, and no matter what time it was will still come around twice in a day.