I have thought a lot about that over these past few weeks because what he said has particular relevance to Christians in the light of Lent and Easter. There is a massive difference between regeneration and resurrection. You can't have resurrection, as it were, on the cheap. There has to be a death. Regeneration means breathing new life into what has come from the past.
Resurrection is always a gift from the future.
In the Resurrection of Jesus God does a new thing. They had nothing to stand upon. There are of course some aspects of our lives individually and corporately which need regeneration but without doubt too there are some which need resurrection. The time for tinkering with the old or trying to do something with it in a new way has gone. The difficulty of course lies in knowing the difference.