Answer:
This quote is spoken by Romeo to Tybalt in Act III, Scene I of William Shakespeare's play, Romeo and Juliet.
In modern English, the quote translates to: "I swear I never harmed you, but love you more than you can imagine, until you come to understand the reason for my love. So, good Capulet - a name that I hold as dearly as my own - be content."
Romeo is attempting to defuse a tense situation between himself and Tybalt, who is angry with him for attending the Capulet's party. Romeo explains that he loves Tybalt's family and means no harm. However, Tybalt refuses to listen and the scene ends with a fatal sword fight.