Some of Paul's Letters are confusing

In our first reading this morning, St. Paul writes to the Corinthians: "For the Son of God, Jesus Christ...was not “yes” and “no,” but “yes” has been in him.

This struck me as confusing, eventhough I have read it hundreds of times.

Jesus Christ clearly says in the Gospels "no" to lots of different sins; so what does St. Paul mean that there was not “yes” and “no,” but “yes” has been in him"?

In praying over today's first reading for the last 24 hours or so, I am reminded of what St. Peter said at the end of his 2nd letter: 

"Our beloved brother Paul, also wrote to you, speaking of these things as he does in all his letters. In them there are some things hard to understand that the ignorant and unstable distort to their own destruction, just as they do the other scriptures" (2 Peter 3:15-16).

In reading various commentaries, I found little help from them.  But I would like to recommend the USCCB website.  When you go to the "Daily Reading" link, it takes you to a wonderful page where all the readings for the day are on one page.  

The only downside is that the page with the readings does not have any footnotes.  But if you click on "2 Corinthians 1:18-22" at the top right of the page, it takes you to that chapter of the Bible on the USCCB website with the footnotes.

You can click HERE to go to 2 Corinthians 1:18-22.

And once you are there, there is a star right after "faithful" and when you click on it, the footnote says this: 

"Christ, Paul, and the Corinthians all participate in analogous ways in the constancy of God. A number of the terms here, which appear related only conceptually in Greek or English, would be variations of the same root, ’mn, in a Semitic language, and thus naturally associated in a Semitic mind, such as Paul’s. These include the words "yes", "faithful", "Amen", "gives us security", "faith", and "stand firm". 

The point of this homily is this: sometimes when you read the daily readings for Mass, they do not, on your first reading of them, make sense.  But the Church says that it ALWAYS bears fruit in our lives when we dive deeper on the questions that rise in our hearts on our first reading of any passage in the Bible.