I find this passage fascinating. Continuing on the same theme that Paul believes single is better than married he addresses widows, stating they have every right to remarry but they will experience more happiness/blessings if they remain single. That’s his view but it's his concluding statement on the matter that is perhaps more revealing than he intended.
He restates that all he has said regarding being single versus being married is according to his own judgment and then says "and I think I also have the Spirit of God".
It's like he's trying to throw the weight of heaven's approval behind his own opinion.
Peter was received the Holy Spirit on the day of Pentecost shortly after Jesus returned to heaven. One of the evidences were tongues of fire on the heads of all the 120 followers of Jesus waiting in that room for the gift Jesus had promised. Peter was Spirit filled. He preached a mighty sermon and every man visiting Jerusalem for the feast heard the message in their own language. Following that Peter went out with boldness like he had never had before, preaching in the temple, having no fear of the consequences.
Yet later when God asked him to go visit a Gentile believer Peter hesitated and even after he went God had your step in and give His Spirit to Cornelius Himself because Peter's racism prevented him from seeing Cornelius as an equal. God's intervention was apparently evidence enough to push Peter's prejudice aside because he responded "“Can anyone forbid water, that these should not be baptized who have received the Holy Spirit just as we have?” 48 And he commanded them to be baptized in the name of the Lord."
So until this moment it was Peter's "Spirit filled" opinion that baptism was not for Gentiles...
Skip ahead several years and we find Peter and no Paul working together among the Gentiles in Galatia. One day a delegation of Jews comes to visit from Jerusalem and suddenly Peter distances himself from the locals as if they are unclean. Paul rebukes him for it publicly.
What is my point?
There is a reason why the Spirit came in the form of fire. It was foretold. "You will be baptized with the Holy Spirit and with fire". When Jesus received the Spirit at His baptism there was no fire. Instead the Spirit descended "like a dove".
A dove symbolizes peace. Fire represents refining or purifying. There was nothing impure to burn out of the heart of Jesus. Peter and the others? That was a different story...
All that to say this. We think our opinions are Holy. If we love God and have experienced proof that His Spirit is at work in our lives than surely our thinking is always right... right?
The evidence suggests otherwise.