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