Listen to what he wrote. I've said before that every craftsman searches for what's not there to practice his craft. A builder looks for the rotten hole where the roof caved in. A water carrier picks the empty pot. A carpenter stops at the house with no door.
Workers rush toward some hint of emptiness, which they then start to fill.
Their hope, though, is for emptiness, so don't think you must avoid it. Those verses describe the paradox all of us who preach must learn to navigate namely, that our speech exists in tension with God's silence. The subject of our speech as preachers is elusive. One moment it looks like a lion and the next like a lamb. One moment it looks like a dove fanning the sun with its white wings and the next like an eagle bearing down on its prey.