en_tn/2co/03/05.md

competent in ourselves

"qualified in ourselves" or "sufficient in ourselves"

to claim anything as coming from us

Here the word "anything" refers to anything pertaining to Paul's apostolic ministry. AT: "to claim that anything we have done in ministry comes from our own efforts" (See: rc://en/ta/man/translate/figs-explicit)

our competence is from God

"God gives us our sufficiency"