To be “poor in Spirit” is less about material poverty and more about recognizing our reliance on God for all things. This is how I was taught to understand the first beatitude.
Humility, or meekness, is not bowing or cowering as it is often portrayed. Rather it more an understanding of who we are in God’s eyes. We are “precious in His sight.” At the same time, we are insignificant, and He is all powerful.
When I was young, a Dominican priest visited our military chapel. He shared the answer a young boy, about my age at the time had given to the question, “How big is God?”
“God is so big the Universe cannot hold Him, and yet so small He fits in my heart.”