The apostle Paul, apostle to the Gentiles wrote this letter to one of his churches he founded years before on an earlier mission. Corinth was a city of depravity and sexual perversion, yet the Corinthians had followed Christ eagerly when Paul was there for 18 months.
Now he had reports from their pastor Apollos that they were dividing into factions. He lambastes them for preferring one minister over another, pointing out that each minister performs a different function.
He also corrects them for tolerating sexual sin, where a man was living with his mother-in-law. He tells them to put the man out of their church.
They also are eager to possess supernatural gifts such as tongues and yet they cause confusion in the churches with multiple people speaking at once. He insists tongues be paired with the gift of interpretation or the speaker should be quiet.
This all leads to Paul's discourse on 'the most excellent way', the best gift of all, the gift of love. This chapter alone makes the book worth reading, as it has been for 2000 years.
3 If I speak in the tongues of men and of angels, but have not love, I am a noisy gong or a clanging cymbal. 2 And if I have prophetic powers, and understand all mysteries and all knowledge, and if I have all faith, so as to remove mountains, but have not love, I am nothing. 3 If I give away all I have, and if I deliver up my body to be burned,[a] but have not love, I gain nothing.
4 Love is patient and kind; love does not envy or boast; it is not arrogant 5 or rude. It does not insist on its own way; it is not irritable or resentful;[b] 6 it does not rejoice at wrongdoing, but rejoices with the truth. 7 Love bears all things, believes all things, hopes all things, endures all things.
8 Love never ends. As for prophecies, they will pass away; as for tongues, they will cease; as for knowledge, it will pass away. 9 For we know in part and we prophesy in part, 10 but when the perfect comes, the partial will pass away. 11 When I was a child, I spoke like a child, I thought like a child, I reasoned like a child. When I became a man, I gave up childish ways. 12 For now we see in a mirror dimly, but then face to face. Now I know in part; then I shall know fully, even as I have been fully known.
13 So now faith, hope, and love abide, these three; but the greatest of these is love.