How do we know that only the wise will enter the kingdom of heaven?

The distinction between the wise and foolish virgins in Matthew 25 illustrates that true faith is not merely outward profession but a possession of the Holy Spirit, represented by oil. The wise virgins carried extra oil, which signifies having the life and light of the Holy Spirit. Consequently, only those who possess the Spirit's illuminating power, which directs them to Christ, will enter His kingdom. The parable serves as a warning against mere external religion and emphasizes the necessity of genuine heart transformation through the Spirit.