Faith comes through "hearing" the "voice" of God. This comes through the Holy Spirit either when He highlights a scripture we are reading, directs us to a scripture He wants to speak to us, or drops one of His thoughts into our minds directly. All of these require learning to listen to our thoughts for what might be His thoughts. It is better to learn to listen before we experience trouble so that we will be ready to acquire faith when the crisis comes. We do this by devoting time daily to being still to listen to him with a journal, bible and pen.