What role does faith play in salvation according to Isaiah?

Faith in God is central to the message of salvation found in Isaiah 1:18. The invitation to 'come now' reflects the requirement of active belief and trust in God's promises. Salvation is not a passive experience but requires a deliberate response of faith from sinners. This faith leads to obedience and is rooted in the assurance that God will accomplish His purpose in saving His people. The doctrine of sovereign grace emphasizes that it is God who instills this faith, enabling sinners to respond to His call.