"Blessed are the poor in spirit, for theirs is the kingdom of heaven."
To be "poor in spirit" means to understand and realize out own guilt and problems. In this Beatitude, our minds and our spirits must be lucid in order to comprehend the teachings of God. Living this Beatitude also allows one to have a clear mind, allowing that person to thoughtfully do the will of God. Therefore, I believe that this Beatitude enables a person to consistently have a clear mind to make the right choices that may benefit the lives of others, to freely do the will of God, and to avoid actions or emotions such as pride to cause us to sin.
An example of a person practicing this Beatitude may be a ruthless gang leader who doesn't think about the people he may be hurting as a result of his violent, careless action. Then, one day while walking down a street, he saw a crucifix, causing him to freeze for a short period of time. Suddenly, this gang leader realized that his actions were wrong and careless, so he decided to repent and change his ways to help people instead of terrorizing them.