Effectual calling
Wayne Grudem suggests that it is a summons from the King of the universe that has "such power that it brings about the response that it asks for in people's hearts . " Grudem appeals to the story of Lydia: according to Acts 16:14 , "The Lord opened her heart to respond to Paul’s message" ( NIV ) . 
<triplet> Lydia <subj> Acts <obj> present in work