Original post here.
The text reads:
If you are young and in love — beware! If you think the girl of your choice is the loveliest being God ever created — guard her every moment of your life! For the time may come when you will know the horror of realizing that, unseen and unsuspected — in the very air about you — foul, obscene beings are watching your happiness with virulent envy…That other yes than yours are gloating over the intimate beauties of your loved one!
Interior art from Terror Tales, July / Aug, 1937 for the story The Bloodless Ones.