Matt 9:27-31
Two Blind Men came to Jesus crying out and saying “have mercy on us.” Jesus questioned them and asked “do you believe that I’m able to do this?” Their answer was a resounding “Yes Lord!”
Verse 29 says he touched their eyes and said “according to your faith be it unto you.” Then their eyes were opened.

The checkpoint seems to be their mouth. The scale Jesus used seems to be their faith.

Mark 6:5-6 speaks of Jesus being able to do no mighty works because of the city’s unbelief.
Even in Mark 16:14 Jesus rebukes the disciple’s unbelief and hardness of heart because they did not believe those who had seen him after he had risen.

Wow! How important it is for us to check our faith and to be sure we’re developing it on a daily basis.