Specifically, "saving yourself three times a day" means that a person has to reflect on his words and deeds many times a day, including doing things for others, interacting with friends, and treating the lessons taught by teachers. This kind of reflection can help us find our own shortcomings, correct our mistakes in time and improve our moral cultivation.
In short, this sentence tells us that everyone makes mistakes sometimes, but as long as we can always be vigilant and seriously reflect on our words and deeds, we can gradually become more perfect.