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It is not enough for Christ to spread his own wholesome teaching; he must warn against the dangerous influence of bad teachers. Later in his ministry he had occasion to speak of the pretended shepherds, who were really thieves, or at best hirelings (John 10:10, 12). Here his reference to the tree and its fruit is meant to be applied to the teacher and his work. It shows that he expects people to be watchful over those who assume to be their instructors. Christians are to judge prophets.

I. THE QUALITY OF THE WORK IS DETERMINED BY THE CHARACTER OF THE WORKER.

1. Work is fruit. A man's true work is not something which he has chosen to do by free selection from any number of possibilities. It is the very product of his being; it is himself thrown out and expressed in action. All real work is a growth from a man's life.

2. The fruit must correspond to the tree. It is not just a miniature tree, but it is "after its kind." The teaching and life-work may not be merely photographs of the mind of the teacher and worker, but they will correspond in kind. This is necessary because it is natural. Christ's parallel goes beyond an illustration, and becomes an argument from analogy. The whole course of nature makes it monstrous to suppose that good work can come from bad men, or bad work from good men.

II. THE WORKER MUST BE JUDGED BY HIS WORK.

1. He should not be judged prematurely. We are tempted to form hasty prejudices about people, the results of first impressions. But these are most delusive. A pretentious or an attractive teacher may be worthless. One who vexes and offends us may be a very prophet of God. The present popularity of a preacher is a poor test of the value of his ministrations.

2. His work must be examined. Our Lord distinctly requires this. We are not to judge men in private life and as to their own individual conduct. But when any one takes on him the office of a public teacher he invites examination. It is not incumbent on us to criticize for the sake of the criticism, but we must decide whether a man whom we follow is leading us aright.

3. The test is to be found in final effects. There are snares in the judgment by results. We may look only at external effects; we may be impatient for quick returns; we may mistake quantity for quality. It is necessary to wait for some autumn fruit ripening. Then the question is as to kind and quality. If these are good, the teaching is wholesome. The best form of Christian evidences is the biography of Christian men. Honest missionary reports are an important element in apologetics.

III. THE BAD WORK WILL CONDEMN THE UNWORTHY WORKER. The tree only exists for the sake of its fruit. Its goodly shape, its vigorous growth, its luxuriant foliage, count for nothing, or worse them nothing, for they cumber the ground. What would be a merit in the forest is a fault in the garden. Trees planted for fruit must bear fruit, or they will be useless. It is bad to produce poisonous or worthless fruit; but it is also a matter of condemnation to be barren, like the fruitless fig tree of the parable (Luke 13:6-9). God's test at the great judgment will ignore the fame of popular preaching, the glitter of daring thinking, the honour of exalted position. All will go by the quality of the output. And on this test will follow more than the acceptance or the condemnation of the work. The worker himself will be judged - condemned or rewarded. - W.F.A.

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KJV: Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves.

WEB: "Beware of false prophets, who come to you in sheep's clothing, but inwardly are ravening wolves.