"Grace and peace to you from God our Father and the Lord Jesus Christ." NIV translation
Paul continues with his usual opening by asking for God's grace and peace to be upon the Corinthian believers. Once again, he is deliberate in that he places grace before peace as a reminder that, without it, we could not have peace with God. Without peace with God, there can be no peace in our human relationships either.
"I always thank God for you because of his grace given you in Christ Jesus. For in him you have been enriched in every way - in all your speaking and in all your knowledge - because our testimony about Christ was confirmed in you." NIV translation
God is the one that grants wisdom and abilities and Paul reminds them of that fact. We must remember that they were in a city where many so called "great thinkers" did not even believe in God. He is reminding them that the knowledge that they possess can only come from God. He also reminds them of how God used him and his ministry team to tell them of the gospel. They heard and responded to that grace and were given the knowledge of the things of God.
"Therefore you do not lack any spiritual gift as you eagerly wait for our Lord Jesus Christ to be revealed." NIV translation
When we accept Jesus Christ as our Lord and Savior, we receive the gift of the Holy Spirit. Because of the very presence of God inside of us, we do not lack any spiritual gifts. These spiritual gifts are what Paul called the "fruit of the Spirit" in Galatians chapter five. The very fact that we have the Spirit assures us that we have the tools we need to live our lives to please God until Jesus returns.
"He will keep you strong to the end, so that you will be blameless on the day of our Lord Jesus Christ. God, who has called you into fellowship with his Son Jesus Christ our Lord, is faithful." NIV translation
God has given us the tools to live a life that honors Him and these tools will keep us growing stronger in our walk with Him. The word "fellowship" here describes a partnership with God in which we do our part and He does His part. Because of the nature of God, He will not look at our failures and turn His back on us but will still do His part in and through us. When we take those tools out and begin using them, we will get better and better at using them.