This is probably the most important beatitude out of all of them because they talk about care of the unfortunate and when they get to Heaven, they will be happy and glad with God.
Jesus is the Light of the World and he wants to live out this beatitude in everyday life. He wants to make the gloomy, happy and the poor, wealthy. Jesus will do that in the Chosen Land.
God created all people different with different abilities to everything in life and people have good qualities, but they also have bad ones. Everyone is different and that relates to this scripture passage.
The definition of consoled is comfort at a time of grief. This means that God will comfort the people who are at mourn right now, later when they meet together.
My two key words I picked were mourn and consoled because mourn is what they are now and consoled is what they will be later when they meet up with God. God will comfort them with love and affection and will take the mourn off them to bring comfort and protection.