Behold, this is the joy of his way - This is evidently sarcastic. “Lo! such is the joy of his course! He boasts of joy, as all hypocrites do, but his joy endures only for a little time. This is the end of it. He is cut down and removed, and the earth and the heavens disown him!”
And out of the earth shall others grow - This image is still derived from the tree or plant. The meaning is, that such a plant would be taken away, and that others would spring up in its place which the earth would not be ashamed of. So the hypocrite is removed to make way for others who will be sincere, and who will be useful. Hypocrites and useless people in the church are removed to make way for others who will be active and devoted to the cause of the Redeemer. A similar sentiment occurs in Job 27:16-17. This closes, as I suppose, the quotation which Bildad makes from the poets of the former age, and in the remainder of the chapter he states another truth pertaining to the righteous. This fragment is one of the most interesting that can be found any where. As a relic of the earliest times it is exceedingly valuable; as an illustration of the argument in hand; and of the course of events in this world, it is eminently beautiful. It is as true now as it was when uttered before the flood, and may be used now as describing the doom of the hypocrite, with as much propriety as then, and it may be regarded as one of the way-marks in human affairs, showing that the government of God, and the manner of his dispensations, are always substantially the same.