Qadr is an arabic term which translates to predestination. This is part of any muslims aqeedah (belief). It is one of the articles of faith we as muslims believe in. To remember that every detail of our life was crafted by Allah SWT, Al Wadood, the Most Loving, and al Fattah the Knower of Subtleties is something that brings a worried heart an immense amount of peace. Someone may have hurt us, we may not be getting a reply from a job sent