pride (oneself) in (something)
To take satisfaction in, be proud of, or highly value some action for which one is renowned. Our company has always prided itself in its excellent customer support and commitment to customer satisfaction. Janet prides herself in always finishing her projects under deadline.
pride oneself in something
and pride oneself on somethingto take pride in one of one's qualities or accomplishments. She prides herself in her ability to spot a shoplifter. I pride myself on my ability to find compromises.