Knock knock! Who's there? (Macbeth)

Here are some wonderful sayings we all use nowadays... I think they are very descriptive and I like to use them sometimes, these are from Macbeth; 

All our yesterdays 
Bear a charmed life 
Be-all and the end-all 
Come what come may 
Crack of doom 
Infirm of purpose 
Knock knock! Who's there? 
Milk of human kindness
One fell swoop 
Something wicked this way comes ... (usually my sister)
A sorry sight 
Sound and fury 
There's no such thing (?) 
and lastly…. What's done is done

Shakespeare wrote this famous play, it is written in old English. Macbeth is about 3 evil witches, a Scottish noble called Macbeth, his friend and his wife. My favourite is 'Something wicked this way comes...' because it reminds me of my little sister.