What does the oil in the lamps represent in the parable?

In the parable of the ten virgins, the oil in their lamps symbolizes the divine life that must be present in the believer's soul to be truly prepared for Christ's return. This oil is often interpreted as the Holy Spirit's work in regenerating and sanctifying an individual, making them 'wise unto salvation.' The wise virgins, who maintained oil in their vessels, represent believers who have the genuine grace and life of God active in their hearts. It highlights the distinction between mere outward profession and authentic transformative faith, underlining the necessity of possessing this divine assurance to enter into eternal glory with the bridegroom, Jesus Christ.