No miracles can ever be scientifically proven – because whenever they are they immediately cease to be miracles and become scientific fact. When you stop and think about it, all of science is really just a succession of proven miracles.
To properly do penance one must express contrition for one’s sins and perform acts to repair the damage caused by those transgressions. It is only when those acts are complete that the slate can truly be wiped clean and amnesty gives way to a new beginning.