“If your brother or sister sins against you, rebuke them; and if they repent, forgive them. 4 Even if they sin against you seven times in a day and seven times come back to you saying ‘I repent,’ you must forgive them.”
5 The apostles said to the Lord, “Increase our faith!”
6 He replied, “If you have faith as small as a mustard seed, you can say to this mulberry tree, ‘Be uprooted and planted in the sea,’ and it will obey you. (Luke 17:3-6, NIV)
Some powerful thoughts from NT Wright on this passage:
Perhaps not surprisingly, the disciples realize in verse 5 that all this will require more faith than they think they have. Jesus is quick to respond. It’s not great faith you need; it is faith in a great God. Faith is like a window through which you can see something. What matters is not whether the window is six inches or six feet high; what matters is the God that your faith is looking out on. If it’s the creator God, the God active in Jesus and the Spirit, then the tiniest little peep-hole of a window will give you access to power like you never dreamed of. Of course, this cannot be used for your own whim or pleasure; as soon as you tried, it would show that you’d forgotten, once more, who this God really was.
Wright, T. (2004). Luke for Everyone (p. 204). London: Society for Promoting Christian Knowledge.
We need the humility to understand it is not our “great faith” that gets anything done. It is our great God who works through us.