Merriam-Webster’s dictionary defines the word ‘oxymoron’ as a concept that is made up of contradictory or incongruous elements (such as cruel kindness) and there are hidden concepts in the Bible, which is the infallible word of God.

Ephesians 1:13-14 states that when we believe in the Lord Jesus Christ as God, sent from God the Father for the redemption of mankind and acknowledge his Sovereignty, we are sealed by God the Holy Spirit.
13 In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise,
14 Which is the earnest of our inheritance until the redemption of the purchased possession, unto the praise of his glory.

While it may seem that to be sealed would imply being subjected to or under captive hold (Paul introduces himself to be a bond servant in majority of his epistles to the Churches), it is interesting to recognize the oxymoron  in these verses  i.e., Only those who are sealed in this world by the Holy Spirit are the ones who will be free in the world to come. Think about it.
Are you sealed now so we can be free to reign with God in the world to come or are will you be under bondage in the world to come because you choose to be free from being sealed by the Holy Spirit, by not accepting Jesus Christ in this world, while life lasts ephemerally? This is a serious question and needs to be answered now because it has eternal consequences.

What is it – Sealed now, Free later or Free now and Sealed (in bondage) later?