How do we know the necessity of being ready for Christ's return?

In Matthew 25:1-13, Jesus tells the parable of the ten virgins, highlighting the critical importance of being ready for His return. Five were wise and prepared with oil for their lamps, while five were foolish and unprepared. This story reflects that not all who appear religious or are awaiting Christ are truly ready; only those who have the 'oil' of grace in their hearts will enter the wedding feast. It's a reminder to watch for the unexpected return of Christ and to actively cultivate a life of faith and readiness.