Jamieson, Fausset and Brown on Matthew 25:2

2. And five of them were wise, and five were foolish--They are not distinguished into good and bad, as Trench observes, but into "wise" and "foolish"--just as in Mt 7:25-27 those who reared their house for eternity are distinguished into "wise" and "foolish builders"; because in both cases a certain degree of goodwill towards the truth is assumed. To make anything of the equal number of both classes would, we think, be precarious, save to warn us how large a portion of those who, up to the last, so nearly resemble those that love Christ's appearing will be disowned by Him when He comes.