Why is something special called “the apple of your eye”?

People always have something special and there are many ways to call your special one or special thing. For most people it will be the line that is “the apple of your eye”. This expression dates from a very long long time, in the old days people thought the eye ball was solid and spherical like an apple, so that’s what they called it. Therefor anyone or anything compared to your eyeballs, would instantly be something¬† very special to you. In the bible it even talks about it, Moses says “He found him in a desert land, and in the howling waste of wilderness; he encircled, he cared for him, and kept him as the apple of His eyes.

Another famous line of the bible is “For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.