In Romans 5-6-11, Paul gives three proofs for the love of God through Christ. He wants to do this because in 5-5 he says God's love is poured into our hearts by the presence of the Spirit. But not everyone -feels- the Spirit the same way, and some genuine Christians wonder if they'll ever seem as strong in Faith as others.--This trembling faith is addressed in 5-6-11, because Paul wants both the strong and the weak to have Faith resting in external, objective truths rather than the fickle human emotions that mislead and discourage.