There are 3 parts to this ritual: the cross, the crosses, and the cleansing.
They all use the same incantation:
In nomini patri, et file, et spiritu sancti, in nomini Jesu Christi, amen.
“In the name of the father, the son, and the holy ghost, in the name of Jesus Christ, amen.”
A note on Christian magic:
You do not need to be a Christian in order to use the power and spells that have brought their organization to power over millenia. There are millions of practicing Christians in the world right now, lending power to their spells. You can access this power, by tapping into the archetype of Jesus Christ. If you have a distaste for their religion and orthodoxy, as many magicians do, you have a choice to let that distaste interfere with your ability to access the power they have stored in the aether.
Part 1: The Cross
Bring your sage stick from your forehead down to your waist, and from one shoulder to the other. If you know the Qabalistic Cross, this has the same format.
In nomini patri – in the name of the father – at your forehead. Visualize a ball of white light around your entire head, energized by the sage smoke.
Et file – and the son – at your waist. Bring the light down into your second chakra.
Et spiritu sancti – and the Holy Ghost – from one shoulder to another – right to left is my preference, but different schools have different opinions. The Holy Ghost is what brings our souls into fruition, giving dimension from the line.
In nomini Jesu Cristi – in the name of Jesus Christ – you are invoking one of the most powerfu spiritual figures in the human collective unconscious. Bring your hands to your heart as the power comes together within you.
Amen – Bow. Let the light collect inside of you, magus.
Part 2: The Crosses
In front of you, draw a cross with the sage. “In nomini patri, et file.”
Turn to your right, and draw a cross to the South. “Et spiritu sancti.”
Turn to your right, and draw a cross to the West. “In nomini Jesu Cristi.”
Turn to your right, and draw a cross to the North. “Amen.”
These crosses seal your circle from outside influences.
Part 3: The Cleansing
Now you will do the traditional “smudge” technique of cleansing your personal energies using sage smoke.
Dash the stick to the left side of your head, then the right, then behind. The modified incantation:
In nomini patri, et file, et spiritu sancti,
Abbe male spiritus, abbe male spiritus, abbe male spiritus,
In nomini patri, et file, et spiritu sancti, in nomini Jesu Christi, amen.
Swipe along your shoulders, in front of your chest, down your front, around both side of your legs, around your feet, up the back, and finally once around the entire body. Repeat the full incantation as much as you need to until complete.