The central message of this sermon is that God's word is sufficient for salvation, and that reliance on external signs or miracles is not necessary for conviction or repentance. The rich man in the parable, who requests Lazarus to be sent back to warn his brothers, represents those who believe they can justify themselves through some external means, rather than humbly submitting to God's word. This message advances the belief that faith comes by hearing and obeying God's word (Romans 10:17), and not through extraordinary or supernatural experiences. The takeaway is that God has provided everything we need for salvation in his word, and if that's not enough, then nothing else will suffice.