When one young woman left on an 18-month mission, she left behind more than her boyfriend: she also left 16 letters for her sweetheart to open during their time apart.

Jackson Casimiro, who is not yet a member of the Church, posted a thread online showcasing the letters, which each have specific “open when” instructions. Some are for specific times, like “Open on your 18th birthday” and “Open when you start college,” while others are for specific trials, such as “Open when you feel like crying” and “Open when you need peace.”

Bustle.com writer Lucia Peters calls this “one of the sweetest things I’ve ever seen.” She adds, “A lot of thought, effort, and time clearly went into the project, and almost more important than the letters themselves is what they represent: They’re a way to be there during the big moments when you can’t actually be there. And that? That’s a lesson we could all take to heart.”

image credit ldsliving.com

image credit ldsliving.com

See the rest of the pictures of the letters and the full story at LDS Living.