Laminated printed sign in blue and red ink on white paper. The sign reads: "Only love can conquer hate."

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 condolences and wishes for strength and courage. The church's contact information is included on the back of the envelope.

Floral tag from floral arrangement addressed to Jerry sent by Darlene [last name redacted]. The tag reads: "To Jerry, Will always remember your kindness and compassionate bedside manner at SSH [Shadyside Hospital]. Love, Darlene [last name redacted] RN." The note is handwritten in black ink on white paper with a watermark in the lower center.

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.

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.

Post-it note with handwritten message in blue marker. The message reads: "Thank you for being strong."

Floral tag from floral arrangement sent by the Manitoba Islamic Association in Canada. The tag reads: "Words cannot begin to express our sorrow at the senseless attack at a house of worship. Please accept our deepest condolences from the Manitoba Islamic Association." The message is printed on a tag from a local florist.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Dear Tree of Life Synagogue, 'Blessed are those who mourn for they will be comforted.' Know God's arms are wrapped around your community and the love of all of us are cradling you. Love, Susan [last name redacted], Moderator, Presbytery of San Diego.

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 made by a student from the George Washington University Hillel. Card reads: "My thoughts and prayers are with your community. Stay strong, because the entire world is with you. - George [last name redacted]."

Post-it note with handwritten message in green marker. The message reads: "Shalom" (Peace). Creasing and tearing due to exposure to the elements at the Wilkins memorial.

Preprinted card with swirling design on front. Interior includes handwritten message expressing solidarity with Tree of Life Congregation.

Printed tag with a photograph of David Rosenthal. The tag reads: "In Memory of David Rosenthal." Creasing and staining due to exposure to the elements at the Wilkins memorial.

Post-it note with handwritten message in black marker. The message reads: "Sending love from Detroit, MI." Tape on the upper edge.

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 on its shell, legs, and neck. The back contains a handwritten note and a sticker with blue text reading: "Stronger Together." The stock signature: "From your friends at West Allegheny Middle School" appears in the lower center.

Envelope containing letters written by members of the Point Loma Community Presbyterian Church in San Diego, California. The envelope is labeled with a piece of paper reading: "Letters for Tree of Life Synagogue."

Hand painted sign with an illustration of a landscape a sun, large blue flower, green grass, and several hearts. The message, "I love you" has been painted next to the blue flower.

Card made by a student from the George Washington University Hillel. The front reads: "In our hearts" and shows an illustrated heart. The back reads: "Your Jewish family in D.C. is thinking of you and sending so much love your way. Love, GW Hillel."

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.