“I give thanks to my God always for you because of the grace of God that was given you in Christ Jesus, that in every way you were enriched in him in all speech and all knowledge— even as the testimony about Christ was confirmed among you— so that you are not lacking in any gift, as you wait for the revealing of our Lord Jesus Christ, who will sustain you to the end, guiltless in the day of our Lord Jesus Christ.” (1 Corinthians 1:4-8)
Paul wrote this epistle to correct errors and problems which had arisen among the Christians in Corinth. Many of the Corinthian brethren, primarily Greeks converted from paganism, were still living under the perverse influence of their cultural background and upbringing. This manifested as an overemphasis on the showy spiritual gifts of words of knowledge and speaking in tongues as well as a predilection for dynamic and eloquent preaching. These were considered by some factions in the Corinthian church as marks of super spirituality, indications that they had already achieved perfection.
But the Corinthian brethren were far from perfect. Factions had arisen which split the church. When Christians take sides against each other they no longer demonstrate the unity or love of Jesus Christ. Consequently, the light of the gospel was darkened.
Judging from these opening verses, you would not know this because Paul has nothing but praise for their behavior. Perhaps we can learn a lesson of how to deal with others who rub us the wrong way. Paul used tact and praise before criticism and correction. In my experience an avalanche of negative criticism leads to nothing but frustration, guilt and animosity. Words of praise for what we do right will temper adverse criticisms and make us more likely to heed them and so address our faults and sins. It will eventually promote the cause of the gospel as brethren manifest unity, humility and repentance.