Write a short and personal letter. Think about supportive words to communicate your sympathy to the retreatant. If you are addressing the letter to a person you don’t know, there’s no need to put your name or contact information on the letter.
Express your feelings to the retreatant. Write that you are glad he is having such an experience. You can briefly mention your personal experience and how the retreat worked for you.
Reassure the retreatant you will be thinking about her and praying for her, if it is a spiritual retreat. Say something like “As a gesture of love I will pray for you during this Sunday’s mass, for the success of your retreat.”
State you will be looking forward to the person’s return to finish the letter. Sign the letter with your first name.
Tips & Warnings
Write “Dear Sister/Brother” if you address the letter to someone you don’t know but who is in a spiritual retreat.