Shakespeare wants the audience to understand that regardless of what happened throughout the play, Macbeth's bravery returns in a full circle from Act 1 to the final act where he dies on the battlefield</b>
This quote can be interpreted to state that the royals were terrible at judging a character's personality
Instead of looking at loyalty and honesty, they just seem to look at bravery which is why King Duncan faces betrayal from the previous Thane of Cawdor and future Macbeth