1 Then said he unto the disciples, It is impossible but that offences will come: but woe unto him, through whom they come!
2 It were better for him that a millstone were hanged about his neck, and he cast into the sea, than that he should offend one of these little ones.
3 Take heed to yourselves: If thy brother trespass against thee, rebuke him; and if he repent, forgive him.
4 And if he trespass against thee seven times in a day, and seven times in a day turn again to thee, saying, I repent; thou shalt forgive him.
5 And the apostles said unto the Lord, Increase our faith.
6 And the Lord said, If ye had faith as a grain of mustard seed, ye might say unto this sycamine tree, Be thou plucked up by the root, and be thou planted in the sea; and it should obey you.
7 But which of you, having a servant plowing or feeding cattle, will say unto him by and by, when he is come from the field, Go and sit down to meat?
8 And will not rather say unto him, Make ready wherewith I may sup, and gird thyself, and serve me, till I have eaten and drunken; and afterward thou shalt eat and drink?
9 Doth he thank that servant because he did the things that were commanded him? I trow not.
10 So likewise ye, when ye shall have done all those things which are commanded you, say, We are unprofitable servants: we have done that which was our duty to do.
11 And it came to pass, as he went to Jerusalem, that he passed through the midst of Samaria and Galilee.
12 And as he entered into a certain village, there met him ten men that were lepers, which stood afar off:
13 And they lifted up their voices, and said, Jesus, Master, have mercy on us.
14 And when he saw them, he said unto them, Go shew yourselves unto the priests. And it came to pass, that, as they went, they were cleansed.
15 And one of them, when he saw that he was healed, turned back, and with a loud voice glorified God,
16 And fell down on his face at his feet, giving him thanks: and he was a Samaritan.
17 And Jesus answering said, Were there not ten cleansed? but where are the nine?
18 There are not found that returned to give glory to God, save this stranger.
19 And he said unto him, Arise, go thy way: thy faith hath made thee whole.
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As the Savior's words show, the question of faith is directly connected with the question of spiritual life as such. What does it mean to increase faith? How did the disciples themselves understand an increase in faith? They must have meant something connected with the confidence they experienced when, at their Teacher's command, they preached the Kingdom and joyfully saw that not only people, but also spirits obeyed them. In those days, this sense of power was usually associated with faith, with its presence or absence. Jesus, however, is speaking of something somewhat different. He speaks of faith as a spiritual state. Precisely and only a spiritual one. After all, any manifestation of inner strength in a person is a natural phenomenon as much as a spiritual one. Here there is not only the spiritual impulse as such, not intention alone, but also nature and the psyche, which also respond to spiritual influence. But Jesus speaks only of the spirit. Only of the will. Only of intention.
Spirit is not nature. Quantitative measurements are impossible here. Spirit, or will, does not come in larger or smaller amounts. If the will is not fragmented, if it is not scattered through inner, psychological space or outer, physical space, it has absolute force. Not in the whole universe created by God, of course; only the will of the Creator Himself has that kind of power. But at one concrete point, it certainly does. That is why faith the size of a mustard seed is enough to move a mountain from its place. Faith here is not inner strength, and certainly not conviction about anything at all, but the fullness of relationship with God. It is that same fullness which, when directed toward creation, becomes the source of an infinitely powerful force, if only it is fully concentrated on something specific. But reaching that kind of concentration is not easy. No psychological techniques will help here.
This concentration is a derivative of that fullness of the life of the Kingdom which, in principle, has been opened after Christ's coming to everyone who seeks. It is the same fullness whose experience lets a person serve without counting merit: we have done what we were supposed to do; we are only servants who do not deserve a reward. It is the fullness in which one understands that every sin is absolutely destructive, and that, although sin is inevitable in the fallen world, complicity in it is always an existential catastrophe for a resident of the Kingdom. It is the fullness that is possible only in the Kingdom and without which there is no Kingdom. The fullness for which alone it makes sense to live.