Packer is lucid, often illustrates well, and is orderly. A good brief discussion appears on what would be true for Christianity if Jesus had not risen. Packer also has good reasons Christians can validly believe that Jesus did rise. A number of other fine discussions are helpful, such as what heaven means, Christ"s public future coming, the Holy Spirit, forgiveness, bodily resurrection, everlasting life, baptism, baptism in the Spirit.