“The apostles said
To the Lord.
‘Increase our faith!’”
Καὶ εἶπαν οἱ ἀπόστολοι τῷ Κυρίῳ Πρόσθες ἡμῖν πίστιν.
Luke uniquely indicated that the apostles asked the Lord (Καὶ εἶπαν οἱ ἀπόστολοι τῷ Κυρίῳ) to add or increase their faith (Πρόσθες ἡμῖν πίστιν). Notice that Jesus was called the Lord (Κυρίῳ) here. Although there are other instances of people having a lack of faith or a strong faith, quite often they were around being healed by Jesus. This saying was the only instance of the apostles, not merely the disciples, or other followers of Jesus, where they specifically wished to increase or add to their belief. Do you want to increase your faith?