The apostle Paul states what authenticates his work, and we also need to understand what authenticates our work in the church.
Galatians 1:11-24 "For I want you to know, brothers and sisters, that the gospel that was proclaimed by me is not of human origin; for I did not receive it from a human source, nor was I taught it, but I received it through a revelation of Jesus Christ.
You have heard, no doubt, of my earlier life in Judaism. I was violently persecuting the church of God and was trying to destroy it. I advanced in Judaism beyond many among my people of the same age, for I was far more zealous for the traditions of my ancestors. But when God, who had set me apart before I was born and called me through his grace, was pleased to reveal his Son to me, so that I might proclaim him among the Gentiles, I did not confer with any human being, nor did I go up to Jerusalem to those who were already apostles before me, but I went away at once into Arabia, and afterwards I returned to Damascus.
Then after three years I did go up to Jerusalem to visit Cephas and stayed with him for fifteen days; but I did not see any other apostle except James the Lord’s brother. In what I am writing to you, before God, I do not lie! Then I went into the regions of Syria and Cilicia, and I was still unknown by sight to the churches of Judea that are in Christ;they only heard it said, ‘The one who formerly was persecuting us is now proclaiming the faith he once tried to destroy.’ And they glorified God because of me." NRSV
What questions surface for you?
What issues might come to a Christian today regarding one's qualifications in doing the Lord's work?
What do you think validates your work as a disciple of Jesus?