Is It Scripture or Is It Shakespeare?

From where do the following phrases get their origin? Note that the wording may vary slightly from the original version. (This quiz comes from Susan Isaacs who is the coordinator of adult formation at St. Mary of the Knobs in Floyds Knobs, Indiana.)

A drop in the bucket



Am I my brother's keeper?



In the blink of an eye



The writing is on the wall



The apple of one's eye



All that glitters is not gold



The root of the matter



Milk of human kindness



The fat of the land



One's own flesh and blood