Card from a congregant at the Holy Angels Parish. The front cover contains a stock illustration of seven children holding hands around a table with a large goblet and loaf of braided bread, and seven doves. The illustration is labeled: "We are people of God's peace." The inside reads: "Everyone will stand with you through these tough times. -Flynn."

Card from a congregant at the Holy Angels Parish. The front cover contains a stock illustration of seven children holding hands around a table with a large goblet and loaf of braided bread, and seven doves. The illustration is labeled: "We are people of God's peace." The inside reads: "I send you all of my sorrowness, and I pray for the victims of the shooting."

Floral tag from floral arrangement, which reads: "We are sorry for your loss and hope you feel better." Note is handwritten in black ink on a printed tag featuring a white rose on the left.

Post-it note with handwritten message in blue ink. The message reads: "Prayers for Pittsburg[h]. May this never happen again anywhere." Color bleeding due to exposure to the elements.

Card with colored pencil and marker illustration. When opened, front side shows illustrations of two five pointed stars and a stack of hearts, and is inscribed: "Margow. We are sorry for your loss." Back shows a tree with spiral-shaped branches and heart-shaped bow and arrows with a rectangular border with hearts in each corner.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter is dated Nov. 4, 2018 and reads: "Dear Friends, I'm at a loss for words to think about the horror you've experienced and the hate that has been directed towards you. Our hearts break with you and I am so sorry this has happened to you. We are with you and are and continue to be praying for you. We are praying for comfort, protection and healing. We love you! Greg and Stephanie [last name redacted] and family."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Our hearts are with you. The Bolsters, Point Loma."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Dear Tree of Life, We are a Junior High small group from PLCPC. We are sorry for your loss. We are praying for the injured and those friends and family of those who died. We will continue to pray as your community continues to heal. Point Loma Community Presbyterian Church San Diego, CA. Mindy, Allison, Ellis, Mike, Logan, Georgia, Ana, Tessa, Sarah, Quinlan."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Ellis [last name redacted] We pray that you will feel better. 2nd Grade. 7 years." The note is accompanied by illustrations of flower pots, stars, a heart, a smiley face, and a stick figure walking in grass with a sun in the background.

Square card with white and yellow text against blue background. Card reads, "Mitzvah4Pittsburgh. Some spread darkness. We spread light. Choose a good deed. Choose a Mitzvah. Add light to the world," followed by four options and a place for respondents to list their name and email address. Some names and email addresses have been redacted for privacy.

Card from two families in Edgewood, Pa. Front cover shows an illustration of two hands holding a cat's cradle yarn configuration with stars. Message expresses thanks to victims and their families.

Card made by a student from the George Washington University Hillel. The front cover contains an illustrated heart. The inside reads: "We stand with you. You are in our thoughts and prayers. With love, Leah and Molly from GW."

Post-it note with handwritten message in blue marker. The message reads: "May you all rest in eternal peace. God Bless [heart]."

Blue card with the words "Stronger Than Hate" in the upper center and the Steelers' logo with a yellow Star of David below. The inside contains a message promising to: "resist hate with love and compassion for others" in memory of those who perished in the October 27 attack.

Square card with white and yellow text against blue background. Card reads, "Mitzvah4Pittsburgh. Some spread darkness. We spread light. Choose a good deed. Choose a Mitzvah. Add light to the world," followed by four options and a place for respondents to list their name and email address. Some names and email addresses have been redacted for privacy.

Note from a member of The Church at Severn Run in Severn, Maryland. The note is enclosed in an envelope with church letterhead, reading: "The Church at Severn Run: Love Well, Live Jesus, Believe Big!" The note inside is dated 10/28/18 and reads: "know that God see you all and may the peace that surpasses all understanding fill your hearts. You all will be in my prayers! -Amen." The church's contact information is included on the back of the envelope.

Note from a member of The Church at Severn Run in Severn, Maryland. The note is enclosed in an envelope with church letterhead, reading: "The Church at Severn Run: Love Well, Live Jesus, Believe Big!" The note inside is dated October 28, 2018 and reads: "Dear Friends, Peace to you. May you live in the love, joy, and kindness of the God of Abraham, Isaac, and Jacob. God is on the throne, always. Harry [last name redacted]." The church's contact information is included on the back of the envelope.