It takes some time to find ; maybe not too long if someone knows a good way to search, or has a good memory of this.
Paul , in a paraphrase translation or word study,
says plainly that
no one's opinion matters - Paul speaking "what I say or what you say is not what's important -
what YHWH says and does is what is important".
This is
confirmed in Y'SHUA'S statement "the flesh profits nothing"
with similar contrast "it is the SPIRIT who / or that/ gives life"
and
"what is born of the flesh [in this case "opinions"] is flesh,
and profits nothing".
and likewise throughout SCRIPTURE/ GOD'S WORD
whenever
referring to mankind/ man's ways/ man's thoughts/ man's hearts
man's wisdom and man's knowledge. i.e. temporal / carnal.