If you are really into Celtic Spirituality, then the Holy Week experience is a passionate immersion into a deep relationship with the crucified Christ, the Blessed Virgin Mary, and the Apostles. One of the clearest elements of Celtic prayer is its IMMEDIACY. By that, I mean that the Celts were able to experience the Passion of Christ as if they were there with him. They achieved this through penitential disciplines (fasting, etc), but also through their imagination. They spoke to Mary, sympathized with her. They stood amidst nature and cried out with the rocks and stones at the injustice being done to the Son of God. They knew that what Christ was doing on the Cross was saving each and every one of them. No past event, the crucifixion was absolutely real to them. Take a look at this poem by the famous Blathmac, c.700 A.D.
Come to me, loving Mary,
that I may keen with your very dear one.
Alas that your son should go to the cross,
he was a great diadem, a beautiful hero...
When every outrage was committed against him,
when capture was completed,
he took his cross upon his back--
he did not cease being beaten.
The King of the seven holy heavens,
when his heart was pierced,
wine was spilled upon the pathways,
the blood of Christ flowing through his gleaming sides...
It would have been fitting for God's elements,
the beautiful sea,
the blue heavens, the present earth,
that they should change their aspect when keening their hero...
Perhaps it is because these people lived so close to the land that they chose to involve all creation in their meditation on the Passion. The IMMEDIACY that I spoke about was coupled with their ONENESS WITH CREATION. They truly felt they joined all nature in weeping over the death of the Lord. And that leads to my last point which deals with Christology--the understanding of who Christ is. THE COSMIC CHRIST is curiously also part of Celtic reflection. They might describe Jesus as the Chief of Chiefs, as one of their own, as an intimate friend, but they also understood that because of his place in the Trinity as the Word of God, Jesus drew all things back to himself and his Father. The Christ permeates all Creation, and once again we have this experience of a dynamic loving God. Pretty cool when you think of it; very awesome.