How do we know faith without works is dead?

In the sermon, Spurgeon emphasizes that faith that saves is not devoid of works. According to James 2:17, faith by itself, if not accompanied by action, is dead. This is echoed in 1 John, where it states that those who profess faith but do not keep God's commandments are liars. Thus, the absence of a holy life as evidence of faith means that such faith is invalid. Saving faith is transformative; it influences the heart, desires, and ultimately leads to a zealous pursuit of good works, as stated in Ephesians 2:10.