Matthew 17:19-21 (17:18) Then came the disciples to Jesus secretly, and said: Why could not we cast him out?

DouayRheims⁽ⁱ⁾ ¹⁹ ^(17:18) Then came the disciples to Jesus secretly, and said: Why could not we cast him out? ²⁰ ^(17:19) Jesus said to them: Because of your unbelief. For, amen I say to you, if you have faith as a grain of mustard seed, you shall say to this mountain: Remove from hence hither, and it shall remove: and nothing shall be impossible to you. ²¹ ^(17:20) But this kind is not cast out but by prayer and fasting.