It is worthy of remark that there is not a trace of asceticism in our Lord's representation. The straitness referred to is not outward, any more than the righteousness is; so that there is no encouragement given to self-imposed restrictions and limitations, as in the monastic vows of "poverty, chastity, and obedience." The way is strait enough in itself without any effort of ours to make it straiter. It is enough that we set ourselves to keep all the commandments; so shall we have a sufficiency of exercise to toughen our spiritual fibre, to strengthen our moral energies, to make us men and women instead of slaves of lust or tools of mammon. For, be it ever remembered, the way we take leads on naturally and unavoidably to its end. Destruction is no arbitrary punishment for self-indulgence; nor is life an arbitrary reward for self-discipline and surrender to the will of God. The path of self-indulgence "leadeth to destruction," by a law which cannot be annulled or set aside. But the path of self-restraint and self-surrender (for these are what make of us men, and not "blind mouths," as Milton expressively puts it), the path which is entered by the strait gate, and is continued along the narrow way, is one which in the course of natural development "leadeth unto life."
The call to enter is followed by words of solemn warning against certain dangers which might beset even those who wish to enter. First, the danger of false guidance: "Beware of false prophets." The danger lies in the future. Hitherto, while speaking throughout of present duty, there have been backward glances over the past, as our Lord has made it evident, point after point, that the righteousness of His kingdom was not the destruction but the fulfilment of the law and the prophets. Now, however, He anticipates the time when there will be those claiming to speak in the name of God, or in His own name, whose doctrines will not be a fulfilment but a destruction of the Truth, and a constant danger to those who may be exposed to their wolf-like ravages. There is manifestly no reference to such differences of opinion as divide real Christians from each other in these days. The doctrine throughout this manifesto is not speculative, but practical; it nowhere brings into prominence matters of opinion, or what are called theological tenets, but everywhere lays stress on that which immediately and powerfully affects the life. So it is here also, as is evident from the criterion suggested for the detection of false teachers: "By their fruits ye shall know them." Besides, the connection in which the caution occurs makes it evident that our Lord had specially in view those teachers who would lead their disciples astray as to the way of life, especially those who would dare to make that easy which he had shown to be "strait," who would set before their hearers or readers a broad path instead of the narrow one which alone leadeth unto life. This is a danger which besets us in these days. There is so strong a sentiment abroad in favour of liberality--and liberality properly so called is so admirable, and has been so much a stranger in times past--that we are in danger of accepting in its name easy-going representations of the Christian life which amount to a total abolition of the strait gate and the narrow way. Let us by all means be liberal enough to acknowledge all who have entered by the strait gate of genuine repentance, and are walking in the narrow way of faith and obedience, however much they may differ from us in matters of opinion, forms of worship, or modes of work; but let us beware how we give even the smallest encouragement to any on the broad road to imagine that they can continue as they are, and find it all right in the end. So to tamper with truth in the guise of liberality is to play the wolf in sheep's clothing.