'Credentials' in the Bible

Jesus answered them, “I have told you so, yet you do not believe. The works that I do in My Father’s name testify concerning Me [they are My credentials and the evidence declaring who I am].

When I arrive, I will send whomever you approve with letters [of authorization] to take your gift [of charity and love] to Jerusalem;

Are we starting to commend ourselves again? Or do we need, like some [false teachers], letters of recommendation to you or from you? [No!]

You are our letter [of recommendation], written in our hearts, recognized and read by everyone.

By ourselves we are not qualified to claim that anything comes from us. Rather, our credentials come from God,

For we are the circumcision, the ones who worship by the Spirit of God, exult in Christ Jesus, and do not rely on human credentials

-- though mine too are significant. If someone thinks he has good reasons to put confidence in human credentials, I have more: