Post-it note with abstract illustration in red marker.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "My prayer- my prayer is for all the people affected to be at peace. Please Lord look after their friends and family, loved ones in this time of need. In God's name I pray. Amen."

Handwritten card from a student at Goddard Middle School in Littleton, Co. The front cover contains the following quote attributed to O.G. Mandino: "Failure will never overtake me if my determination to succeed is strong enough." Illustrated with the image of two stick figures, labeled "strength" and "failure" respectively standing on either side of a wall. The inside reads: "Dear Congregation of the Tree of Life, I am sorry for what happened and I hope everything gets better.

Card with illustration of two dragonflies on the cover. Message affirms the power of love to triumph over hate. The information on the back indicates that this card was purchased in support of UNICEF, the United Nations International Children's Emergency Fund.

Orange card addressed to the Tree of Life Community on the front cover. The inside contains a sincere message of sympathy from a Jewish resident of Erie, Pa.

Card from "Julia L." expressing solidarity with the community.

Post-it note with handwritten message in blue marker. The message reads: "Stay strong [underlined]. If we work together hate can't win! [Heart]. [Heart] Pittsburgh [Heart]. - Stella K."

Post-it note with handwritten message in blue marker. Tape in the upper left corner. The message reads: "This Temple's response to all this hate is beautiful. Hate is not welcome here or anywhere! My blessings to all."

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."

Handwritten note written in black marker on paper reading: "May the light you brought to this world continue to shine. -Fabers."

Folded card with marker illustration. Cover features illustration of tree with ladder. Interior reads, "We are with you at this sorrowful time. The Beth Chai Congregation of Greater Washington." Back cover reads "I hope you feel better. P.S. We will donate $ to you" with two five-pointed stars.

Folded card with crayon and marker illustration. Cover features smiley face. Interior features illustration of heart and of rising sun. Text reads, "Things do get better. We are so sorry for your loss and all the pain you've endured in recent days. Sending our best wishes and love for healing and peace in the days ahead. Beth [last name redacted for privacy] of Beth Chai Congregation in Maryland.

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: "Tree of Life Members, You are in our thoughts and prayers. -Holy Angels CCD."

Card addressed to Cecil Rosenthal. Cover features a reproduction of a painting by Frank Crosby, a resident of the Emmaus Community of Pittsburgh. The inside contains messages of love and support written by other members of the Emmaus Community.

Hallmark card from a member of St. Peter's Episcopal Church in Londonderry, New Hampshire. The front cover reads: "Faith is the friend that comes along when things just seem to go all wrong." The inside reads: "You are not alone in this tragedy. We will pray for God's peace for your community. Love is stronger than hate. Colleen and Michael."

Folded card with marker and colored pencil inscriptions. Cover reads: "Do not cry :-) That is sad." Inside reads: "I am very sad about the bad things that happened to you. I hope this never happens again. Luke [last name redacted for privacy]" and features stylized illustration of two stick figures, representing the writer "me" and the recipients "you guys" holding hands.

Folded card with marker and colored pencil illustration. Front and back cover feature spread of tree emerging from blue field. Interior features scribbles and name "Veronica." Additional message reads "Our hearts go out to you at this tragic time, along with our wishes for healing. The Beth Chai Congregation of Greater Washington, D.C."

Floral tag enclosed in pink envelope from floral arrangement; tape on the lower left front. The tag reads: "You will never be forgotten. Each and every one will live in our memories forever." The note is written in black ink on a printed tag with a floral bouquet in the lower right corner. The reverse is stamped with the contact information for Squirrel Hill Flower Shop.