I WILL HOLD YOU RESPONSIBLE
When Cain killed Abel, he asked God, "Am I my brother's keeper?" God's answer is given through the prophet Ezekiel: a resounding "YES!" We are responsible for not only siblings but for anyone who is part of our life. If we are conscious that any of these people are doing something that will hurt themselves or others, God gives us a duty to give a warning.
The more serious the sin, the more we have an obligation to speak or act. If a friend is about to drive in a drunken condition, we must try to take the keys or offer to drive. If anyone we know is tempted to suicide, we MUST do all in our power to prevent it.
God warns us if we fail to take our obligations seriously. He will hold us guilt for the failure to warn others. This is not simply a pious thought, it is a serious duty!