"The person of superior integrity does not insist upon his integrity. For this reason, he has integrity. The person of inferior integrity never loses sight of his integrity. For this reason, he lacks integrity." – Lao-Tzu
Once you lose integrity, it is very hard to gain that trust back. Therefore, it is imperative that you conduct youself always with understanding of others and always considering what is best for those you serve. The hard decision, it seems like for some, is deciding who you really do serve.
In some organizations it seems like you are supposed to be serving your boss. In some circles, I hear officers say they are supposed to be serving their subordinates. While it important to keep these individuals in mind, if you have integrity, you will ultimately realize that you are supposed to be serving the citizens or customers who depend on you in their time of need. The boss and the subordinates have important roles in how that service is delivered, and therefore, their needs must be considered, but when it comes down to it, if you make decisions based on what is best for the customers you serve, you can't go wrong.