It wasn’t just water and it wasn’t just blood. It was both. And the Spirit. It was actually all three. What in the world does all of this mean? Well, that’s the thing. No one is 100% sure (though no one is that honest). The best we can do is examine how John speaks about water and blood and the Spirit in his Gospel and his letters. And it is there we find some connections.
Most specifically – the moment that Jesus died. He was pierced and blood and water flowed. This speaks of his real, authentic humanity, and the life that came (and still comes) through that death. A life given by the Spirit. This is what we know to be true – is that life does in fact come from death – and we are invited to trust that.