Who stated that priests have an "ontological mark on their souls"?  Only the 'self-referencing' official church.  This was NEVER DECLARED to be so Christ, by the early Church, by any Gospel writer, by the writings of Paul, by the Apostolic Constitution [a summary of the teachings of the Apostles]. 
 
During the post Trenton Age---18th, 19th and early 20th Centuries,  it has been stated over and over so many times---to the laity---to justify the right of the clergy to command obedience.  But anything that has no basis in reality is a lie---no matter how many times it is stated, or by whom.  Read the Documents of Vatican II.  Ontological superiority is going the way of the covered wagon.

The clergy are, Servants----that is what Christ stated.  They only exist as clergy to serve the People of God.  If they walk in Christ's footsteps---as outlined in Matthew 25:35-47----then they can be declared blessed by Christ.