John's gospel tells us that a soldier pierced Jesus' side and out came a sudden flow of blood and water.
Jesus was dead. But water and blood were already flowing from him.
It's what he said - if we ask him he will give us running water, and if we drink that water we will never be thirsty again.
The water he gives us becomes a spring that wells up to eternal life.
You may think I'm talking a load of jargon here. But it's not really hard; it's about recognising Jesus as the source of eternal life and receiving it.
Jesus cried out from the cross: 'I am thirsty.' The one who promised running water was drained dry. He stands alongside all who are drained dry today. But from deep within flows life that has no limit.
He calls us to drink his blood. We act that out in our worship. The life of the body is in the blood. And we receive his life in the ultimate blood transfusion.
Ask Jesus for life this Easter. We'll look further at our Good Friday service, this Friday at 10:00am.