In a statement issued by the Scottish Catholic Church, Cardinal Keith O'Brien said:
I have valued the opportunity of serving the people of Scotland and overseas in various ways since becoming a priest.
Looking back over my years of ministry: For any good I have been able to do, I thank God. For any failures, I apologise to all whom I have offended.
More top news
The announcement came a day after a famine was declared in two areas of South Sudan following three years of civil war and severe inflation.
It is unclear what their alleged plans were.
Anti-terror police are currently questioning the men who were arrested at three separate locations in France.