The biggest blessing for a person is when someone points out to him not only his strengths and virtues, but also his weaknesses and shortcomings.
We see this in the Torah when Yaakov blessed his children before he died. Yet we see that he reprimanded some sons for having faults such as impulsiveness and acting in anger. But that itself was the blessing! When Yaakov told Revuen that he acted impulsively and Shimon and Levi that they acted in anger, he was helping them to focus on the traits they needed to improve. This is the way to self-completion and it is the best blessing possible!
Today, think of a weakness that someone pointed out to you that you need to overcome. Think about how you can improve in this area and turn this criticism into a blessing!
(Sources: see Genesis 49:1, 2, 28; Rabbi Chaim Mordechai Katz – Beair Mechokaik, pp.83-4)