Shakespeare Said It First phrases explanations from dictionary.com

…all that glitters is not gold Things that appear on the surface to be of great value may be quite worthless.

…dead as a doornail dead beyond any doubt

…elbow room sufficient scope to move or function

… full circle to the original place, source, or state through a cycle of developments (usually used in the phrase come full circle  ).

… good riddance the act of getting rid of something undesirable or unpleasant; deliverance or removal (esp in the phrase good riddance )

… heart of gold A very kind and good nature, as in Bill is very generous; he has a heart of gold . This expression alludes to gold in the sense of "something valued for its goodness." [Late 1500s]

… sorry sight a sight that one regrets seeing; someone or something that is unpleasant to look at.

…too much a of a good thing Too large an amount of a beneficial or useful thing or activity can be harmful or excessive. For example, The indoor decorations are fine but the outdoor Santa, sled, reindeer, gnomes it's just too much of a good thing . Expressed in slightly different form even earlier, Shakespeare used this precise wording in praise of moderation in As You Like It  (4:1): "Can one desire too much of a good thing?"