Wilson's Dictionary of Bible Types
Isaiah 40:4 (a) GOD will overcome difficult places in the life in order to make the way of life easy and happy for His child. He smoothes out the rocky road, brings down the hills and exalts the valleys to make life a blessing. (See Luke 3:5).
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Watson, Walter. Entry for 'Rough'. Wilson's Dictoinary of Bible Types. https://www.studylight.org/dictionaries/eng/wdt/r/rough.html. 1957.