The Edomites were descendants of Esau, the elder of the twin brother of Jacob. Ever since Jacob (Israel) stole Esau's birthright in exchange for his stew, the animosity between these two brothers (Edom and Israel) never ceased: "You should not look down on your brother in the day of his misfortune, nor rejoice over the people of Judah in the day of their destruction, nor boast so much in the day of their trouble" (v.12). Edom had become proud as the people lived in caves high on the mountain sides. They had also become wealthy and possessed a strong army. They took advantage of Jacob's misfortunes. But their pride and arrogance had become the reason for their downfall and destruction.
Jesus has warned us against pride: "For everyone who exalts himself will be humbled, and he who humbles himself will be exalted" (Luke 14:11). Success of any kind--even in ministry--can generate a kind of pride and arrogance that will attract God's judgement to cut us down to size: "See, I will make you small among the nations; you will be utterly despised." Those who think themselves too big will be made to feel small and despised.
Father, You have called us to humble ourselves before You, not because You are so great and we are so small, but because You Yourself are so humble. Amen.