I like this thread! Here are a couple of mine that I remember the most:

Me to therapist: "you would be one of five people I would love to meet again in heaven"
Therapist: "I'll be looking for you!"

Me to therapist: " thank you for letting me love you, it means a lot"
Therapist: " No problems cause I love you too!"

Me to therapist: " Sometimes I love being here in your office, I feel so safe."
Therapist: " I always want to make a safe place for you to come and just be,"