1 Corinthians 1:30 (ESV)

30 And because of him you are in Christ Jesus, who became to us wisdom from God, righteousness and sanctification and redemption,

The way in which the Corinthian believers had suddenly become somebodies in God’s eyes is now briefly explained. They were given the position of being in Christ Jesus. Christ has become their wisdom. The content of this wisdom is described in three words: righteousness, sanctification, and redemption. Each of these words calls to mind a specific image of the gospel.

Righteousness is a legal term. As the judge of the world, God has declared believers to be righteous, based on the perfect obedience of Christ. Sanctification is a term that reminds one of temple service. Those who are in Christ are holy, dedicated to God. Redemption means liberation (e.g., that of a slave or prisoner) through the payment of a ransom.