Matthew 5:3 KJV
Blessed are the poor in spirit: for theirs is the kingdom of heaven.
When I think of being poor in spirit, I think of someone who doesn't think too highly of themselves. They are not prideful; therefore, they are open to receive the Holy Spirit. They are not filled with themselves, so the Holy Spirit can fill them and they become a child of God-a part of the kingdom of heaven.
I pray that I never get so prideful that there isn't room for the Holly Spirit. As a human and a child of sin, pride is something with which we all struggle. May we strive to be poor in spirit so we can be rich with the Holy Spirit.