Some naysayers will always let you know when you have failed or are less than stellar. They speak with authority and knowledge. At least, that is what they want you to believe.
We should listen since there may be wisdom in their message, but we should always know where it comes from. It is easy to accept their words if they have achieved themselves or offer their words in genuine encouragement. Too often the intent is misaligned and disingenuous, and the advice is misplaced.
All too often, it is easier to speak than to do. So keep on doing, and let them talk since it will be the actions we will ultimately evaluate.