If this statement is true, then most of us are fools, because I am yet to come across anyone who, at some point of time or another, has not made the same mistake twice.
In an ideal world, it would be possible to learn from every mistake that we make, and never repeat them. In fact, in a perfect world it would be possible to learn from the mistakes that others make. But, unfortunately, the world we live in is hardly perfect.
For a variety of reasons, we are not even able to learn from our own mistakes every time. But, if we make a conscious effort, it is possible to reduce the occurrence of repeated mistakes.