Never hide your mistakes, because they aren't meant to be hidden. What do you learn from hiding your mistakes? You learn only how to conceal them furthur. You learn only how to push the blame to others.
On the contrary, shed some light onto your own mistakes. Let the world see it. Most importantly, let you yourself see it. Talk about it. Think about it. Reason about it. Understand the lessons learnt and face the music. We move on, feeling better, feeling enriched.
The bravest man is not one who is able to overcome the treacherous mountains and gain glory for himself. The bravest man is not one who is fearless in front of his enemies. The bravest man is not one who is able to topple the fiercest beast on earth. The bravest man, is one who is able to overcome his own mistakes, conquering the person within.
There is no fanciful ideology in this. It is a simple concept. Many a times, it is just a matter of whether we are brave enough to admit it.