Mea culpa

Mea culpa was a Latin phrase, an acknowledgement of doing wrong.

When the Sixth Doctor was brought back to Space Station Zenobia, he believed he was being put on trial again, and admitted to having stolen a TARDIS and run away from Gallifrey, quoting "Mea culpa, mea culpa, mea máxima culpa!" to Inquisitor Darkel, before she clarified that he was not being tried. (AUDIO: Trial of the Valeyard)