Answer:
a cue that an important word might follow
Explanation:
In John Bunyan's "The Pilgrim's Progress", the town of Vanity (home of the ancient Vanity Fair) is reached through the straight and narrow path that starts in Hill Difficulty. In order to reach Vanity, one must go across the Valley of Humiliation and fight with the monster Apollyon, and also traverse the fearsome Valley of the Shadow of Death.
He (is )planning for a picnic
Or
He (will be) planning for a picnic
