The LORD asked Cain, “Where is your brother Abel?” He answered, “I do not know. Am I my brother’s keeper?” The LORD then said:  “What have you done! Listen: your brother’s blood cries out to me from the soil!" (Gen 4:1-15, 25)
https://bible.usccb.org/bible/readings/021323.cfm
In October, 1996, I attended the display of the Names Project AIDS Memorial Quilt on the Mall in Washington, DC. While there I visited the US Holocaust Memorial Museum. In the Hall of Remembrance (the Chapel) of the Museum, I noticed the Genesis quote engraved on the wall: “What have you done? Hark thy brother’s blood cries out to me for the ground.” i remember looking through the window and seeing the Quilt displayed and saying to myself, “My brother is lying out there on the Mall.” Do we hear our brother, our sister, crying out to us? Or are we like Cain who says, “Am I my brother’s keeper?”