The Hebrew concept Paul and James were writing about is aman, which is a verb meaning to be firm, to build up, to support, to nurture, or to establish. The primary meaning is that of providing stability and confidence. According to Scripture this type of faith is a gift from Yahveh, a manifestation of the Holy
Spirit. It is not something we can muster and therefore no one saved by faith which can only be received as a gift from Yahveh may boast that they earned salvation by deciding to believing.