To this end we also pray always for you, that our God may count you worthy of your calling, and fulfill every desire of goodness and work of faith, with power;
The greatest "calling" extended was the one extended by Jesus (Matthew 11:28-30). We are called to Him by the gospel (2:14). If we reject the calling of our Lord, then we will be turned away (Proverbs 1:24-26). MacKnight writing about the phrase "worthy of this calling" says: