Does anyone know if studies have been done on the effect on the immune system of visualisation and/or prayer?

I had to look up lorica.

Not being a Christian, I was still struck by the words; for personal use this came up:

Prayer to Life

Arise!
In gratitude and awe, by the grace and love of the Divine.
May the loving fire of the sun, purify and gently touch my heart,
May I act in harmony and the beauty and richness of the earth sustains me;
May the swiftness of the wind blow away my foolishness and clear my thinking
May the waters of the world cleanse and support me
As I swim in the ocean of Life,
And lead me,
To compassionate wisdom through the flowing aether.

Arise!
May the Grace of the Divine fortify me on the way;
Divine Compassion uphold me, Divine wisdom guide me,
May I see within as I look without
May I hear the stillness of peace as I listen to the world,
And feel a Divine hand, touch and point the way, lighting a path in truth,
May Divine Grace touch my heart, like the perfume of an opening rose,
That I find courage through humility and love of life,
To have self control and keep actions in balance and harmony
To be Just and true through right relationships with all beings and things
I call out to life, near and afar,
When alone or in a mulitude.

Arise!
May the Divine guide me today in feelings, thoughts and actions
The beauty, love and richness of the earth below,
The majesty, beauty and love of the Sun above
Love, compassion and mercy within me,
Love, compassion and mercy before me and behind me,
Love, compassion and mercy on my right and on my left,
Held in the hands of the Cosmos
May I swim true in the ocean of Divine light.

Arise!
May I know the Divine in the heart of everyone I think of,
May I know the Divine in everyone I speak of,
May I know the Divine in those I meet,
And then, to find, and follow the pure light path

Arise!
And give thanks for the gift of life.