God told Ezekiel to warn the people of Israel. If he warned them and they didn't repent, their blood would not be required at his hand. But, if he didn't warn them and they died in their sin, then he would require their blood at his hand. In other words, he would be held responsible.
It's the same way for us today. We must warn those living around us to turn from their sin and turn to God. I believe with all of my heart that if we don't warn those who are in sin and they die in their sin, God will hold us responsible. I am not saying that we will be turned away by God , but that He will chastize us for not telling the lost that we come in contact with about what Jesus did for them. Awesome thought isn't it?
How awful if would be if when we finally stand before God, he is ashamed of us because we didn't reach out to the lost around us. We are to be Watchmen over the lost, the same as Ezekiel was. Woe to us if we do not warn others. May God give us the courage everyday to share the good news of the gospel with everyone we come in contact with.