JER 12:5

5 [Then to show me that I needed to be prepared to endure even greater difficulties, Yahweh said to me], [“It is as though] you have become exhausted from racing against men; so how will you be able to race against horses? If you [stumble and] fall when you are running on open/bare/smooth ground, what will happen to you when you are running through the thornbushes near the Jordan [River]?