Why can we trust that Christ's work is sufficient for salvation?
We can trust Christ's work is sufficient for salvation because He claimed to have done everything necessary, and He is faithful. The blood of Christ is faithful; He is faithful. Salvation rests not on the strength of our love or faith, but on His love for us and His faithfulness to keep us.
Les explains that just as a person sits in a chair without inspecting it, trusting the chair to be faithful and hold them, so we place faith in Christ. Christ has claimed to have done everything necessary for salvation. When we reach the eternal abode, God will not say it wasn't what it seemed; He will declare that the blood of Christ is faithful. He is faithful, and that is why we can trust Him. Les sees Paul driving at this: it is through the faithfulness of the One who is faithful to keep us, because He loved us and gave Himself for us. Even a child's question about loving God enough or having enough faith is answered by the truth that it is not how much we love Him, but how much He has loved us.