From which Shakespearean work does the quote below come from and what are the circumstances in which it is spoken?
For after I saw him fumble with the sheets, and play with the flowers, and smile upon his finger's end, I knew there was but one way; for his nose was as sharp as a pen, and 'a babbled of the green feilds.
The lines you quote are from the play Henry V. These lines are spoken in Act II, Scene 3. The lines are spoken by Mistress Quickly, who is the Hostess and Keeper of the Boar's Head Tavern in London.
When she speaks these lines, she is in the company of Boy, Pistol, Nym and Bardolph. The reason she is saying these things is because she is remembering Falstaff. Falstaff has just died and she is talking about how he died. She was there when he died, and the words she says are describing how she knew that he was about to die.