And he said to his disciples, “Temptations to sin are sure to come, but woe to the one through whom they come!  It would be better for him if a millstone were hung around his neck and he were cast into the sea than that he should cause one of these little ones to sin.  Pay attention to yourselves! If your brother sins, rebuke him, and if he repents, forgive him,  and if he sins against you seven times in the day, and turns to you seven times, saying, ‘I repent,’ you must forgive him.”
 The apostles said to the Lord, “Increase our faith!”  And the Lord said, “If you had faith like a grain of mustard seed, you could say to this mulberry tree, ‘Be uprooted and planted in the sea,’ and it would obey you.
 “Will any one of you who has a servant plowing or keeping sheep say to him when he has come in from the field, ‘Come at once and recline at table’?  Will he not rather say to him, ‘Prepare supper for me, and dress properly, and serve me while I eat and drink, and afterward you will eat and drink’?  Does he thank the servant because he did what was commanded?  So you also, when you have done all that you were commanded, say, ‘We are unworthy servants; we have only done what was our duty.’”
(Luke 17:1-10 ESV)
 And you were dead in the trespasses and sins  in which you once walked, following the course of this world, following the prince of the power of the air, the spirit that is now at work in the sons of disobedience— among whom we all once lived in the passions of our flesh, carrying out the desires of the body and the mind, and were by nature children of wrath, like the rest of mankind.  But God, being rich in mercy, because of the great love with which he loved us,  even when we were dead in our trespasses, made us alive together with Christ—by grace you have been saved— and raised us up with him and seated us with him in the heavenly places in Christ Jesus,  so that in the coming ages he might show the immeasurable riches of his grace in kindness toward us in Christ Jesus.  For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,  not a result of works, so that no one may boast.  For we are his workmanship, created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them.
(Ephesians 2:1-10 ESV)