Mordecai won the affection of King Achashverosh and thereby escaped Haman’s gallows. When he was sitting at the palace gates, he overhead a plot to kill the king, and shared this information. This is why King Achashverosh awards him. Why was Mordecai hanging around the palace? Because every single day Mordecai would go walking in front of the women’s court to know how Esther fared and what would be done for her. Thus, while Mordecai was seeking the welfare of Esther, he overhead information that led to his own salvation. Sometimes we are busy helping someone else and Hashem is busy finding a way to help us.