The world is grasped by a whirlpool of destruction. It tried to delay the inevitable but with little success, It does not understand the stream of heaven which purifies and awakens people to God. However, when sin is committed and there is no repentance, this stream becomes polluted and unable to awaken people to God.
Only repentance and reparation can cleanse this stream and keep it a vital force in human history, bringing forth a goodness in people that pleases the Father.
When unrepented sin enters, this stream loses its power and the Father must cleanse the world by chastisements. This is the only option unless man turns back to God.
Comment: The image is very clear, a stream coming from heaven which awakens man to heavenly things. Sin destroys the power of this stream. So, either man repents or God chastises, the only two ways of keeping the stream powerful.