How do we know Christ is a suitable savior?

The suitability of Christ as our savior is grounded in His perfect qualifications. He must represent us as a man, be sinless, and yet able to endure the punishment for sin. As stated in the sermon, no mere man could carry the burden of sin, but Christ, being fully God and fully man, was foreordained from the beginning of time to fulfill this role perfectly. His life of obedience and His sacrificial death meet the requirements set forth by God's holiness, making Him the only viable Savior capable of ransoming His people from sin and death.