Why is the concept of true faith important for Christians?

True faith is essential for Christians as it signifies complete reliance on Jesus Christ for salvation, rather than on one's own works or merit. According to the sermon, like Moses, Christians must reject earthly wisdom and the notion that works can earn favor with God. True faith enables believers to see Christ as the ultimate treasure, prompting a rejection of worldly desires and an embrace of suffering for the sake of the Gospel. This transformational aspect of faith is rooted in God's grace, making it a divine gift, rather than an act of human will, as explained in Ephesians 2:8-9.