2 John 1:4

I rejoice greatly that I have found certain of thy children walking in the truth, even as we received commandment from the Father.

Certain of thy children ... One may only conjecture as to whether this could be a veiled charge that some of "her children" were not walking in the truth. What is affirmed here is that the apostle found a source of rejoicing in knowing that some were so walking. Any gospel minister whose life span has covered any considerable time know what this is. In the summer of 1978, this writer and his wife attended the Yosemite Family Encampment in California; and there, for the first time in 42 years, and 45 years, respectively, we were privileged to meet persons whom we had baptized long ago, and with whom a reunion was held after those long years of not even knowing if they were even still living. The rejoicing that resulted from finding them still active and diligent in the faith of Christ, after so many years, was indeed a blessing of God.

Even as we received commandment from the Father ... Again, the apostolic "we" is prominent in this letter.