Post-it note with handwritten message and illustration in blue marker. The note features an illustration of a winged angel with a sad face in the center and a sun in the upper right corner. The words: "Love > hate [encircled with a slash trough the center]" appear below.

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.

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

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 the Friendship Circle of Illinois. The cover reads: "To the Jewish community of Pittsburgh, From: Ari [last name redacted]." The acronym "B"SD" (with the help of heaven) appears in the upper right corner. The left flap on the inside features a large smiley face. The right flap reads: "I feel very bad for you and there should be always good stuff. And there be no bad stuff and Moshiach should come right NOW!!" A smiley face has been inserted inside the letter O.

Card made by a student from the George Washington University Hillel. Card reads: "Praise the Lord, all you nations, extol Him, all your peoples for great is His love toward us. And the faithfullness of the Lord endures forever. Praise the Lord." This message is an English rendering of Psalms 117:1-2.

Post-it note with handwritten message written in black marker. The message reads: "We are always with you. You are not alone. Be strong." A smiley face and heart appear below.

Piece of notepad paper with a pencil drawing of a flying angel with wings and a halo.

Triangle-shaped card from a student at Fountain Valley School in Colorado Springs, Co. The card reads: "Dear members of Tree of Life, I am a Chinese [student] who is now studying in U.S. I am sorry about the situation that happened recently. Personally, I support you, do not be afraid! Peace be with you." Star of David in the upper center, peace sign in the bottom center.

Post-it note with handwritten message and illustration in black marker. The note is signed: "[heart] Dorothy" and features two abstract circle and oval shaped illustrations.

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 reads: "Love conquers all!! You are a child of God, therefore, you are loved. Continue to pray and worship. Please don't let hate win, love will overpower through all. Jenna [last name redacted]. YOU ARE LOVED!" The church's contact information is included on the back of the envelope.

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.

Handwritten "Prayer of St. Francis" written in black ink on white paper, glued to cardboard. Warping due to exposure to the elements at the Wilkins memorial.

Handwritten letter expressing sympathy and messages of goodwill from various lay members of the San Dieguito United Methodist Church in Encinitas, California. Last names redacted for privacy.