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

Card made by a student from the George Washington University Hillel. The card features a Star of David and reads: "Dear Pittsburgh, I miss you terribly. I miss my home now more then ever. I stand with my city and my Jewish community now and forever. I am sending all my love from DC."

Floral tag from floral arrangement sent by the Orange County Islamic Foundation in Mission Viejo, California. The tag reads: "The Orange County Islamic Foundation in Mission Viejo, California extends its sincere condolences and prayers to your congregation. We join you and support you in your moment of grief." The message is printed on a tag from a local florist.

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.

Floral tag from floral arrangement sent by Daniel Mulhall, the Irish ambassador to the United States, on behalf of the people of Ireland. The note is printed on a tag with a beige background from a local florist.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Words can't begin to express the sorrow we have felt and experienced as a church, country and people for the senseless loss and hatred you all have experienced. We pray and hope you feel God's peace, comfort and loss in this time of great sorrow. Love will win. Peace will win. Always. Your sister in God's love..."

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. Due to water exposure at the memorial site, the message in this card has been partially erased. The remaining text inside reads: "...for your loss...[f]or you...Devon from CCD Hol[y] Ange[ls]...[mem]bers of the Tree of life."

Yellow laser print with inscription in black ink; blue heart. Blank back.

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 condolence, prayer, love, and unity. The church's contact information is included on the back of the envelope.

Card with gold background and illustration of a rose bud stem with leaves. The message inside is addressed to the members "who were, are, and will be part of the Tree of Life synagogue" and affirms the sender's solidarity and God's greatness.

Post-it note with handwritten message in blue marker. The message reads: "May their memories be a blessing." Signed in Hebrew: [heart] "Miriam."

Post-it note with handwritten message in green marker. The message reads: "Live for those we have lost. Be well. Love from Boston MA."

Hand painted card. The card contains the Stronger Than Hate symbol with a yellow Star of David on the left. The words: "Stronger than Hate" appear in a black text box to the right. A heart appears above.

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.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter is dated Nov. 4, 2018 and reads: "To the beautiful Tree of Life community in Pittsburgh from a Presbyterian in San Diego: Shalom... May your deepest sorrows be comforted by God's soothing peace. May you feel the support of others around the world. Imagine me, a teacher named Carolyn V., carrying 2 buckets to hold your tears and mine as I grieve with you. Never let evil win. LOVE WILL TRIUMPH. Love from C. [last name redacted] [heart symbol]."

Post-it note with handwritten message in blue marker. The message reads: "Hate is not welcome here! May love, community, and peace shield you with The Tree of Life." Signed: "[Heart] Temple Beth Shalom, Florida, N.Y."

Post-it note with handwritten message in black marker. The message reads: "We love you!" An illustrated heart appears in the upper right corner.

Rectangular cardboard sign. Front reads, "LOVE They Neighbor" with a heart in purple, green, blue, and read marker. Back includes signatures from the Wolfson children.

Card on light pink paper with handwritten note and illustrations. The card reads: "I love you. I pray for you. Lyla [last name redacted]." Hand drawn illustrations of a blue flower, red heart, and red tulip appear below.

Post-it note with handwritten message in green marker. The message reads: "Love Wins [heart]."