In today's first reading, St. Paul is headed for Jerusalem, trying to get there in time for Pentecost. (He does not know what fate awaits him; he only knows he must be brave.)
In Miletus, he tells the presbyters from Ephesus:
"But now I know that none of you to whom I preached the kingdom during my travels will ever see my face again. And so I solemnly declare to you this day that I am not responsible for the blood of any of you, for I did not shrink from proclaiming to you the entire plan of God."
If you put that last bit contrapositively, you get something like:
I shrank from proclaiming to you the entire plan of God, so I am responsible for the blood of some of you.
Which, if you think about it, is kind of unsettling. If, you know, you happen to be one of those rotten scoundrels who tends to shrink from proclaiming to others the entire plan of God.