“Wherefore also we pray always for you, that our God would count you worthy of this calling, and fulfil all the good pleasure of his goodness, and the work of faith with power:”
King James Version (KJV)
1:11 All the good pleasure of his goodness - Which is no less than perfect holiness.
2Th 1:11 Wherefore also we pray always for you. In view of this glorious judgment, he prays that they may stand and be counted worthy. Of [this] calling. The Christian calling. Fulfil all the good pleasure of [his] goodness. The idea is "Perfect in you the love of goodness and the work of faith".