Why is it important to be 'in the Spirit' on the Lord's Day?

Being 'in the Spirit' on the Lord's Day signifies a deep spiritual engagement where believers are open to God's revelation. It allows for communion with God, fostering genuine worship and receiving His Word. John, while exiled, expressed this experience, stating he was 'in the Spirit' on the Lord's Day. This illustrates that true worship transcends physical circumstances and involves being influenced actively by the Holy Spirit, enabling believers to focus on Christ and receive revelation, comfort, and assurance of His active work in their lives.