I think that is the first step to delving into the concept of mercy. It gives reference to our heart and to his mercy, and with that, a sense of compassion, respect and above all forgiveness. Months ago, I was asked what I defined as mercy and I instinctively responded forgiveness.  Quite simply, I think this is the main form of piety. The first step is knowing how to acknowledge mistakes, and more difficult is accepting others despite their mistakes. As they say in Latin "Porta Itineris dicitur longissima esse."  Going through the door is the longest part of the journey. In my view, forgiveness is of vital importance to mercy.     On December 31, while my vacation time in Rome was running out, I went to St. Peter's to pass through the Holy Door accompanied by my parents.  I joined them in a symbolic gesture, in duty, but also of commitment. It was the best way to close 2015 and a promise to ourselves for the upcoming new year. If there is one aspect that I learnt about mercy, it was this one.