The Gospel is not the good news of "God is not angry anymore". It is also not the message of Jesus saving you from a hell the Father made to destroy you in. It is the message of God giving you immortality on account of His love.
In this teaching Bertie explains the setting wherein Jesus said that a person needs to be born again. He explains what it means to be born of water as well as what Jesus meant when He said that those born of the Spirit are like the wind.