It is customary for a candidate up for any catholic sacrament to nominate a person to be his / her sponsor. Being asked to sponsor a catholic sacrament is a great honor and a catholic confirmation letter is written in this situation to confirm your presence at the occasion and offer words of faith and encouragement.
The letter is formal, though it can sway towards the informal side as well depending on your relationship with the addressee.
One should start by thanking the addressee for choosing you to be his / her sponsor, confirm your presence at the sacrament, and express your deep gratitude at being selected for the honor. You can see how to write such a letter in the example given below.
{Date}
Dear {Recipient},
Congratulations on your confirmation! This is a big step to take along the path of your Catholic faith. You have always had a strong faith, and I am certain it will only continue to blossom into adulthood.
{Share a story you remember about the person which reflects that person’s faith}. Being a Catholic has been such a central part of my own life, and I am certain that it will be just as big a part of your own life journey.
Once again I congratulate you, and welcome you deeper into our faith! God bless you!
Yours truly,
{Letter writer}
