Is a bird that wandereth from her nest - Leaving her own brood, places of retreat, and feeding-ground behind, and going into strange countries, where she is exposed to every kind of danger. So is the man who leaves his family connections and country, and goes into strange parts to find employment, better his circumstances, make a fortune, etc. I have seen multitudes of such wanderers from their place come to great misery and wretchedness. God's general advice is, "Do good, and dwell in the land; and verily thou shalt be fed."
Change of place is thought of as in itself an evil. It is not easy for the man to find another home or the bird another nest. The maxim is characteristic of the earlier stages of Hebrew history, before exile and travel had made change of country a more familiar thing. Compare the feeling which made the thought of being “a fugitive and a vagabond” Genesis 4:12-13 the most terrible of all punishments.