Mourning means when you are really sad. This can be when you lose a close person or pet to you. It is ok to be sad because God will come to comfort you.
Blessed are the poor in spirit People are the 100% most happiest when they are not attached to materials things that they do not need. We should be happy to give them up and share with other people.
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 think of themselves too highly. You should always think of others and doing nice things for others around you.