Lauda Sion Salvatorem is a sequence prescribed for the Roman Catholic Mass of Corpus Christi. It was written by St. Thomas Aquinas around 1264, at the request of Pope Urban IV for the new Mass of this Feast, along with Pange lingua, Sacris solemniis, Adoro te devote, and Verbum supernum prodiens, which are used in the Divine Office. The hymn tells of the institution of the Eucharist and clearly expresses the belief of the majority of Christians that the bread and wine become the body and blood of Jesus during the celebration of the Eucharist. Transubstantiation is the philosophical name given to the process which explains how this happens in Roman Catholic tradition. As with St. Thomas' other three Eucharistic hymns, the last few stanzas are often used alone, in this case, the Ecce panis Angelorum.
Lauda Sion is one of only five medieval Sequences which were preserved in the Missale Romanum published in 1570 following the Council of Trent (1545–63). Before Trent many feasts had their own sequences. It is still sung today, though its use is optional in the post-Vatican II Ordinary form. The Gregorian melody is borrowed from the 11c sequence Laetabundi iubilemus attributed to Adam de Saint-Victor.
You bring joy to my life
And I'm so glad that we are together
You're the one who lifts me up
You bring sunshine where there's stormy eweather
When I think of you
I thank you for your love and understanding
Like a plane you make me fly
You bring our love to a happy landing
I found out, what love's all about
There's one thing I want ot show you
I want you to know, you're my lady sun
You're my reason for living, you light up my day
You're my lady sun, you're my reason for living
Don't you go away
Just wanna let you know
The way we love is very special to me
And when you touch me
You send a chill uh huh, right thru me
You're the one that I can trust deep down inside
I know you won't deceive me
Hope dreams would disappear into the air
If you should ever leave me
I found out, what love's all about
There's one thing I want to show you
I want you to know, you're my lady sun
You're my reason for living, you light up my day
You're my lady sun, you're my reason for living
Don't you go away
You're my lady sun, you're my reason for living
You light up my day
Don't you ever leave me, don't you never
We have a love shining together
It shines like the sun