I was reading in Acts this morning...
Paul and Barnabas were preparing to embark on a mission; return visits
to places they had already been to see how the brethern were doing.
Barnabas wanted John Mark to go with them, Paul did not. They had a
strong disagreement, so strong in fact, that Barnabas and Paul
separated with Barnabas taking Mark with him, and Paul partnering up
with Silas.
So, even the best of the best have disagreements. It's part of the process.
Ed C