A particular Church, probably that at Babylon, was intended. They who love in the truth, also love on account of the truth. A prayer, however, is implied besides a confident affirmation. Grace must first do away with man's guilt before his misery can be relieved by mercy. Therefore grace stands before mercy.
Peace is the result of both, and therefore stands third in order.
Casting all our care on the Lord, with thanksgiving, maintains this peace. This verse seems to me to decide that a Church, not an individual lady, is meant. I think the Greek present participle implies both the first and the second advent of Christ. The denial of the reality of His manifestation in the flesh, at His first coming, and of His personal advent again, constitutes Antichrist. The many who in a degree fulfil the character, are forerunners of the final personal Antichrist, who shall concentrate in himself all the features of previous Antichristian systems.