These verses teach us...that true faith will be found very scarce at the end of the world. The Lord Jesus shows this by asking a very solemn question, "When the Son of Man cometh, shall He find faith on the earth?"
The question before us is a very humbling one. It shows the uselessness of expecting that all the world will be converted before Christ comes again. It shows the foolishness of supposing that all persons are "good," and that though differing in outward matters, they are all right at heart, and all going to heaven. Such notions find no countenance in the text before us.
Where is the use, after all, of ignoring facts under our own eyes—facts in the world—facts in the churches—facts in the congregations we belong to—facts by our own doors and firesides? Where is faith to be seen? How many around us really believe what the Bible contains? How many live as if they believed that Christ died for them, and that there is a judgment, a heaven, and a hell? These are most painful and serious inquiries. But they demand and deserve an answer.
Have we faith ourselves? If we have, let us bless God for it. It is a great thing to believe all the Bible. It is matter for daily thankfulness if we feel our sins, and really trust in Jesus. We may be weak, frail, erring, short-coming sinners. But do we believe? That is the grand question. If we believe, we shall be saved. But he that believeth not, shall not see life, and shall die in his sins (John 3:36, 8:24).
J.C. Ryle, Expository Thoughts on Luke