The Word of Perseverance
None of the wounds of Jesus were mortal wounds. Flogging could kill a man but care was taken to not prevent the people's choice (crucifixion or release) that was to follow. Similarly, the mockery of the crowning with thorns was intended to be more painful than the thorns themselves. The nails that pierced him had their utilitarian purpose to hold him to the tree and even the spear thrust that would have killed him if truly administered as a coup de grâce was applied after he was dead just to 'mak siccar.'
The idea of blood 'speaking' is a trope found in Scripture starting from the record of the first human death, that of Abel:
And the LORD said, "What have you done? The voice of your brother's blood is crying to me from the ground." [Genesis 4:10]we ought to make sure that we are listening. The spear thrust produced a copious flow of blood and water that might well have caused the soldier to curse but, as a sign that the curse was over and dealt with, that fountain opened cries out with the force of an echo of the dying words of Jesus, 'It is finished!'
We had better believe it!