Post-it note with handwritten message in green ink. The message reads: "We cannot change the past, but we can inspire the future. Let what's happened here be a warning to us all that there is no room for hate anymore."

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 contains messages of peace, love, and unity. The church's contact information is included on the back of the envelope.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "To our esteemed sisters and brothers I offer sorrow in your losses, comfort to enter into your memories and many blessings for your bright future as a synagogue to overcome. With all my love- Russell [last name redacted]."

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration a pineapple with floral and geometric motifs. The back contains a handwritten note and a "Stronger Together" sticker, as well as the stock signature: "From your friends at West Allegheny Middle School."

Printed tag dedicated to Irving Younger. The tag reads: "Please accept this Random Act of Kindness In honor of Irving Younger. Taken too soon, October 27th, 2018. 1 of our 11 Angels from the Pittsburgh Tree of Life synagogue shooting" followed by a series of hashtags and contact information on Facebook. Tape on the reverse.

Post-it note with illustrations in red marker. A cascading stream of hearts, outlined in red, begins in the upper left corner and extends to the lower right corner.

Handmade card in colored marker on paper. The front of the card features the word: "LOVE" in bubble letters; the letter "o" has been replaced with a large Star of David. Several smaller hearts and a multi-colored asterisk appear throughout. Signed, upper left: "Rylee Love." The back is signed, twice: "Love Rylee" in orange and purple marker, respectively. The card has been laminated.

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: "Don't bully people and stand up for people when they are getting bullied."

Post-it note with handwritten message in black marker. The message reads: "Love is stronger than hate."

Handwritten card from a student at Goddard Middle School in Littleton, Co. The front cover contains the following quote attributed to Hubert H. Humphrey: "The greatest gift of life is friendship and I have received it. Quote is accompanied by Star of David and a heart. Signed: "By Jace S." The inside reads: "Dear Rabbi Jeffrey Myers, I am a student from Colorado and I heard about the news and I am sorry for your loss. Sincerely, Jace [last name redacted], Goddard Middle School." Back reads: "Friends never say goodbye."

Card from a congregant at the Holy Angels Parish. The front cover contains a stock illustration of a haloed dove flying in front of Noah's ark. The inside contains an illustration of a man labeled "Jesus" and reads: "I'm sorry for your family. God loves you, all day every day. We all are praying for you. And I'm sorry for your loss. We will remember your loss. We all love you. Sincerely, Nate [last name redacted]."

Printed card in black ink on white paper. The card contains a large, empty rectangle outlined in black and reads: "I am thankful for people who help me. Nehemiah builds a wall. Nehemiah 1-6."

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a leaf with geometric motifs. The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

Card on blue paper with handwritten note and illustrations. The card reads: "From: Luke. We love you!" Six hearts illustrated in brown and pink pencil appear throughout. Creasing, staining, and fading due to exposure to the elements at the Wilkins memorial.

Black and white laser print with the Stronger Than Hate symbol on the front; Pittsburgh Penguins symbol with Star of David on the back.

Card with the words of the Prayer for Peace handwritten in blank ink on a purple note card on the front and back. The Prayer for Peace is an eighteenth century Chasidic Jewish prayer adopted by liberal Jewish denominations in North America. The note concludes: "In loving memory of Rose Mallinger."