We cannot develop faith simply by our own willpower. Faith is an aspect of the fruitage of God’s holy spirit.
(‏ ١ مل ١٨ :‏ ٤١‏ )‏ أَفَلَا تَحْمِلُنَا هٰذِهِ ٱلْحَوَادِثُ عَلَى فَحْصِ إِيمَانِنَا لِنَرَى هَلْ هُوَ بِقُوَّةِ إِيمَانِهِ ؟‏