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: "Our thoughts and prayers are with you all. God is with you always. God Bless." The church's contact information is included on the back of the envelope.

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."

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: "We mourn for you loss and we pray the God of Abraham embraces you in fresh, new ways today and always! Shalom!" The church's contact information is included on the back of the envelope.

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."

Floral tag addressed to Richard Gottfried. The tag features a white rose on the left and the stock message: "With Deepest Sympathy" in a band on the upper center.

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."

Wreath woven from branches, synthetic greenery, and pink and white synthetic flowers.

Black and white sticker with the word "LOVE" in large capital letters.

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 affirms the sender's belief in God. The church's contact information is included on the back of the envelope.

Sympathy card including handwritten note reading, "Hate Can't Destroy a City of Steel/May the Love and Stories of those lost live on forever/You are all loved by your neighbors."

Post-it note with handwritten message in black ink. The message reads: "We are all brothers and sisters. Your struggle is our struggle. - A Muslim." Color bleeding due to exposure to the elements at the Wilkins memorial.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a bird feather 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."

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.

Post-it note with handwritten message in black marker. The note features a quote from Psalm 116:15, reading: "Precious (costly) in the sight of the Lord is the death of his saints."

Rectangular card from a student at Fountain Valley School in Colorado Springs, Co. The card reads: "Dear members of Tree of Life synagogue, I'm from Vietnam and I stand with you. I'm sorry for your loss. May peace be with you. Shalom [signature]." Illustrated with Vietnamese flag, peace sign, and Star of David.

Post-it note with handwritten message in blue marker. The message reads: "May your loved ones rest in peace. May your hearts heal and know that we are with you and will defend and love you."

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of the words: "Be Strong" and other 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 with ballpoint pen illustration. One side reads "We Are With You" with zigzag decorations in corners. Reverse reads, "Don't worry. You are not by yourself. We will support you!" with illustration of hand reaching out.

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 Sisters and Brothers, Please hold fast to the promise of God's power and presence in all things. While we have choices He has the final word on how our circumstances, losses, and gains will serve His kingdom. You are loved, prayed for, and supported by many in this trying and confusing time, and always. Please reach out the community of believers for any need. Thank you for your continued faith and courage, which inspires generations.

Floral tag from floral arrangement, which reads: "Friends of fallen victims." Message written in black marker on printed tag with a red rose on the left.