Gregory the Great — on Ezek 36:5 (Pastoral Rule, Part 3, Chapter 26)

“For hence it is that under the figure of the Idumaeans, who allowed themselves to be vanquished by their own prosperity, those who rejoice in the successes of this world are rebuked, when it is said, "They have given my land to themselves for an inheritance with joy, and with their whole heart and mind." In which words it is to be observed, that they are smitten with severe rebuke, not merely because they rejoice, but because they rejoice with their whole heart and mind.”