Listen earnestly to anything your children want to tell you, no matter what. If you don't listen eagerly to the little stuff when they are little, they won't tell you the big stuff when they are big, because to them all if it has always been big stuff.
Throughout this entire novel, Meursault has not had any emotion, no matter what has happened to him, or with him. When his mother was found dead, he barely dwelt on the situation at hand. It made it easier for him to move on.