Birth and death. This is our true nature and highest awakening. And Nirvana is the same. We can go back to ourselves and touch our true nature. If we have time to look deeply, we can see the connection between suffering and happiness. Jesus himself realized the role of suffering. As a practitioner of mindfulness we should know how to handle our suffering.
http://tnhaudio.org/2014/04/30/the-resurrection-and-the-stanger/