What does the Bible say about being wise or foolish in faith?

In Matthew 25, the parable of the ten virgins depicts two groups: the wise and the foolish. The wise are those who, having received the grace and life of the gospel through the Holy Spirit, have prepared themselves to meet the Lord Jesus Christ. In contrast, the foolish have lamps but no oil, which symbolizes their lack of genuine faith and preparation for the coming of the Bridegroom, Christ. The significance of this preparation is underscored in verses 13 and 44 of Matthew 24, where believers are instructed to watch and be ready, as no one knows the day or hour of His return. Thus, being wise is to recognize our need for grace and to live in readiness for Christ's coming.