Haydock Commentary:
Ver. 24. Shall seek, &c. Shall desire to be saved; but for want of taking sufficient pains, and not being thoroughly in earnest, shall not attain to it. (Challoner) --- Our Lord answers here in the affirmative: viz. that the number of those who are saved, is very small, for a few only can enter by the narrow gate. Therefore does he say, according to St. Matthew, (Chap. vii.) Narrow is the way that leadeth to life, and few there are that enter therein. This does not contradict what is said in the 8th chapter of St. Matthew: That many shall come from the east, and sit down in the kingdom of God; for many indeed shall join the blessed company of the angels, but when considered with the number of the slain, they will appear but few. (St. Augustine, serm. xxxii. de Verb. Dei.)
http://haydock1859.tripod.com/id77.html
Ver. 23.—Then said one unto Him, Lord, are there few that be saved? Christ answered in the affirmative that few should be saved, as S. Luke signifies and S. Matt. plainly states, vii. 14. Isaiah speaks to the same effect, x. 22; xxiv. 13. Understand “few” by a comparison of all the inhabitants of the whole world; or of the faithful with the unbelieving, for all the latter are condemned for their unbelief, and equally many of the faithful for their wicked lives. The faithful alone are saved, and not all of these. But whether the greater number of them are saved or lost is the question. Some think that the greater number are saved, through the holy sacraments (which very many of them only receive at the end of their lives). Others think that most are lost because they live in a state of mortal sin. The rule of S. Augustine is that as men have lived, so they die. Of these opinions I have shown which is the true one, on S. James ii. 13, on the words “Mercy rejoiceth against judgment.” The judgment of S. Chrysostom, Homily xl. to the Antiochenes, who numbered 100,000 or more, is formidable. “In our city,” he says, “among so many thousands, scarcely can 100 be found who will be saved, for in the youngers is great wickedness, and in the elders deadness.” And S. Augustine (Bk. iv. ch. 53, against Dresconius) compares the Church to a threshing-floor, on which there is much more chaff than grain, i.e. more reprobate than elect.
http://www.catholicapologetics.info/scripture/newtestament/1314luke.htm
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