How to Use "harken" with Example Sentences

1. I just got the call from harken . He wants me back .
2. A failure of the currency , the most profound symbol of european unity , could harken the collapse of the eu itself , they argue .
3. So please harken to my message , because what I have to tell you tonight can bring healing to humanity and healing to our planet .
4. Let us harken to christ 's voice : " well done , good and faithful servant ; you have been faithful over a little , I will set you over much ; enter into the joy of your master ! "