Luke 17:6

He is the true worshipper of God, who not only is himself free from passions, but also sets others free from them; though they be so heavy that they are like mountains, he removes them by means of the faith with which he believes in …

The Lord, showing them that their request is good and that they need to hold firmly to the thought that faith has great power, says: if you had faith, you would transplant even this mulberry tree. Here there are two great things, namely: that which …

The disciples hearing our Lord discoursing of certain arduous duties, such as poverty, and avoiding offences, entreat Him to increase their faith, that so they might be able to follow poverty, (for nothing so prompts to a life of poverty as faith and hope in the Lord,) and through faith to guard against giving offences. Therefore it is said, And the Apostles said unto the Lord, Increase our faith. But our Lord told them that they asked well, and that they ought to believe stedfastly, forasmuch as faith could do many things; and hence it follows, And the Lord said, If ye had faith as a grain of mustard seed, &c. Two mighty acts are here brought together in the same sentence; the transplanting of that which was rooted in the earth, and the planting thereof in the sea, (for what is ever planted in the waves?) by which two things He declares the power of faith.

Second, as to the progress of faith consisting in the cooperation of free will, it is added: And the Lord said: If you had faith like a grain of mustard seed. By the grain of mustard seed, which in itself is small in quantity, fervent …

(22. Mor. c. 21.) That is, that the faith which has already been received in its beginning, might go on increasing more and more unto perfection.

The Lord said: If you had faith as a grain of mustard seed, you would say to this mulberry tree: Be uprooted, and be transplanted into the sea, and it would obey you. He compares perfect faith to a grain of mustard seed, which is …

Or our Lord here compares perfect faith to a grain of mustard seed, because it is lowly in appearance, but fervid in heart. But mystically by the mulberry tree, (whose fruit and branches are red with a blood-red colour,) is represented the Gospel of the cross, which, through the faith of the Apostles being uprooted by the word of preaching from the Jewish nation, in which it was kept as it were in the lineal stock, was removed and planted in the sea of the Gentiles.

And he said, If ye had faith as a grain of mustard seed - If ye had the least measure of true faith, no instance of duty would be too hard for you. Ye would say to this sycamine tree - This seems to have been a kind of proverbial expression.

As with God nothing is impossible, so are all things possible to him that can believe. That, whatever we do in the service of Christ, we must be very humble, and not imagine that we can merit any favour at his hand, or claim it as a debt; even the apostles themselves, who did so much more for Christ than others, must not think that they had thereby made him their debtor.

And the Lord said,.... In answer to the disciples.

We do not know the secret feelings from which this request sprang. Perhaps the hearts of the apostles failed within them, as they heard one weighty lesson after another fall from our Lord's lips. Perhaps the thought rose up in their minds, "Who is sufficient for these things? Who can receive such exalted doctrines? Who can follow such a lofty standard of practice?" These, however, are only conjectures. One thing, at any rate, is clear and plain. The request which they made was most deeply important, "Increase our faith!" Faith is the root of all saving religion .

We do not know the secret feelings from which this request sprang. Perhaps the hearts of the apostles failed within them, as they heard one weighty lesson after another fall from our Lord's lips. Perhaps the thought rose up in their minds, "Who is sufficient for these things? Who can receive such exalted doctrines? Who can follow such a lofty standard of practice?" These, however, are only conjectures. One thing, at any rate, is clear and plain. The request which they made was most deeply important, "Increase our faith!" Faith is the root of all saving religion . "He who comes unto God must believe that He is, and that He is a rewarder of those who diligently seek Him." (Hebrews 11:6.) Faith is the hand by which the soul lays hold on Jesus Christ, and is united to Him, and saved. Faith is the secret of all Christian comfort, and spiritual prosperity. According to a man's faith — will be his peace, his hope, his strength, his courage, his decision, and his victory over the world. When the apostles made request about faith, they did wisely and well. Faith is a grace which admits of degrees . It does not come to full strength and perfection as soon as it is planted in the heart by the Holy Spirit. There is "little" faith — and "great" faith. There is "weak" faith — and "strong" faith. Both are spoken of in the Scriptures. Both are to be seen in the experience of God's people. The more faith a Christian has — the more happy, holy, and useful will he be. To promote the growth and progress of faith — should be the daily prayer and endeavor of all who love the Savior. When the apostles said, "increase our faith" — they did well. Have we any faith at all? This, after all, is the first question which the subject should raise in our hearts.

See Mat 17:20. “Sycamine-tree.” This name, as well as sycamore, is given, among us, to the large tree commonly called the buttonwood; but the tree here mentioned is different. The Latin Vulgate and the Syriac versions translate it “mulberry-tree.” It is said to have been a tree that commonly grew in Egypt, of the size and appearance of a mulberry-tree, but bearing a species of figs. This tree was common in Palestine. It is probable that our Lord was standing by one as he addressed these words to his disciples. Dr. Thomson (“The Land and the Book,” vol. i. p. 22-24) says of this tree: “It is generally planted by the wayside, in the open space where several paths meet.” (Compare Luk 19:4.) “This sycamore is a remarkable tree. It not only bears several crops of figs during the year, but these figs grow on short stems along the trunk and large branches, and not at the end of twigs, as in other fruit-bearing trees. The figs are small, and of a greenish-yellow color. At Gaza and Askelon I saw them of a purple tinge, and much larger than they are in this part of the country. They were carried to market in large quantities, and appeared to be more valued there than with us. Still, they are, at best, very insipid, and none but the poorer classes eat them. It is easily propagated, merely by planting a stout branch in the ground, and watering it until it has struck its roots into the soil. This it does with great rapidity and to a vast depth. It was with reference to this latter fact that our Lord selected it to illustrate the power of faith. Now, look at this tree - its ample girth, its wide-spread arms branching off from the parent trunk only a few feet from the ground; then examine its enormous roots, as thick, as numerous, and as wide-spread into the deep soil below as the branches extend into the air above the very best type of invincible steadfastness. […]

Jesus said trees would obey your faith filled words and He proved it.