Final answer:
The quote is spoken by Malcolm, highlighting his commitment to restoring order and justice in Scotland at the end of Shakespeare's 'Macbeth'.
Step-by-step explanation:
The quote that is provided in the question, "...this, and what needful else/ That calls upon us, by the grace of Grace..." is spoken by Malcolm in Act 5 of Shakespeare's Macbeth which was loosely based on the historical king Malcolm III of Scotland. This line indicates Malcolm's intent to right the wrongs in Scotland with careful planning and integrity. It provides a sense of order and justice that contrasts with the deceit and chaos sown by Macbeth throughout the play.
The complete question is:
Choose the speaker from Macbeth act 5: "...this, and what needful else / That calls upon us, by the grace of Grace, / We will perform in measure, time and place."