What does a Guardian Angels mean to You?

If an angel from heaven suddenly became visible to you as you were sitting alone, what would your reaction be? An ancient saint admonished Christians in these words: "In every area ... in every corner, pay a respect to your angel. Dare not do before him what you dare not do before others. Consider with how great respect, awe, and modesty we ought to behave in the sight of the angels lest we offend their holy eyes and render ourselves unfit for their company. Woe to us if they who could chase away our enemy would be offended by our negligence and deprive us of their visit."