Blessed are the poor in spirit for theirs kingdom in heaven which means to not be attached to the things you already have and be thankful to give them up or share them with others
Blessed are those who are mourn for they will be comforted which means that when you are sad. This can happen when you lose a pet or family member God will comfort you in these moments.
Blessed are the meek for they will inherit the earth. People are the most happiest when they are patient this means that people should not always think of themselves all the time and you should think of others.