Thanks to clients, I've recently discovered an Irish writer and poet and I offer you an extract from his message about "Blessings" in his book "Benedictus"
What is a blessing ? by John O'Donohue
A blessing is a circle of light drawn around a person to protect, heal and strengthen. Life is a constant flow of emergence. The beauty of blessing is its belief that it can affect what unfolds.
To be in the world is to be distant from the homeland of wholeness. We are confined by limitation and difficulty. When we bless, we are enabled somehow to go beyond our present frontiers and reach into the source. A blessing awakens future wholeness. We use the word "foreshadow" for the imperfect representation of something that is yet to come. We could say that a blessing "fore-brightens" the way. When a blessing is invoked, a window opens in eternal time.
FOR A MARRIAGE
As spring unfolds the dream of the Earth
May you bring each other’s hearts to birth
As the ocean finds calm in view of land
May you love the gaze of each other’s mind
As the wind arises free and wild,
May noting negative control your lives
As kindly as moonlight might search the dark
So gentle may you be when light grows scarce
As surprised as the silence that music opens
May your words for each other be touched with reverence
As warmly as the air draws in the light
May you welcome each other’s every gift
As elegant as dream absorbing the night
May sleep find you clear of anger and hurt
Read too, my opinion : Sacred : Religious or not ?