Faith does not result in deliverance in every case, however. These verses refer to many different forms of persecution, which would have been particularly comforting to the original distressed readers. Traditionally Isaiah suffered death at King Manasseh"s hand by being sawn in two. [1][source]
"According to ... mutually complementary rabbinic sources, Prayer of Manasseh , enraged because Isaiah had prophesied the destruction of the Temple, ordered his arrest. Isaiah fled to the hill country and hid in the trunk of a cedar tree. He was discovered when the king ordered the tree cut down. Isaiah was tortured with a saw because he had taken refuge in the trunk of a tree ..." [2][source]
Sometimes the faithful person"s reward comes on the other side of the grave. Some of the readers, and we, might have to endure death. Those who accept death without apostatizing are those the world is not worthy of because they do not turn from following the Lord even under the most severe pressure. [source][source][source]