Passage
who also sealed us, and gave [us] the earnest of the Spirit in our hearts.
who also sealed us, and gave [us] the earnest of the Spirit in our hearts.
2 Corinthians 1:20 For how many soever be the promises of God, in him is the yea: wherefore also through him is the Amen, unto the glory of God through us.
2 Corinthians 1:21 Now he that establisheth us with you in Christ, and anointed us, is God;
2 Corinthians 1:22 who also sealed us, and gave [us] the earnest of the Spirit in our hearts.
2 Corinthians 1:23 But I call God for a witness upon my soul, that to spare you I forbare to come unto Corinth.
2 Corinthians 1:24 Not that we have lordship over your faith, but are helpers of your joy: for in faith ye stand fast.
The verse centers on "Spirit", "sealed", "gave", "earnest", and "hearts". It is saying that the verse draws attention to "Spirit" and "sealed", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 21's "Now he that establisheth us with you..." into verse 23's "But I call God for a witness...", so "Spirit" and "sealed" belong inside that flow. In 2 Corinthians context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "Spirit" and "sealed" with trust shaped by these words, not by a vague optimism outside the passage.