Mary's Heart When Jesus Was a Child: When Luke says that Mary "kept these things in her heart", does this mean she doesn't really understand who He is? [Luke 2:51]. Mary Not Understanding Jesus: What didn't Mary understand when she was in the temple with Jesus after He had gone missing? [Luke 2:50]. Mary Had More Kids: Does the passage support that Mary probably had more children, since she lost track of Jesus? [Luke 2:41-50].