The following is from J.C. Ryle’s Expository Thoughts on the Gospels, on John 6:1-14 when Jesus fed the 5,000.
Let us never doubt for a moment, that the preaching of Christ crucified, — the old story of His blood, and righteousness, and substitution,– is enough for all the spiritual necessities of all mankind. It is not worn out. It is not obsolete. It has not lost its power. We want nothing new,– nothing more broad and kind,– nothing more intellectual,– nothing more efficacious. We want nothing but the true bread of life which Christ bestows, distributed faithfully among starving souls. Let men sneer or ridicule as they will. Nothing else can do good in this sinful world. No other teaching can fill hungry consciences, and give them peace. We are all in a wilderness. We must feed on Christ crucified, and the atonement made by His death, or we shall die in our sins.
Even today, with all of man’s inventions and technological advances, we still need the same old gospel of Jesus Christ for salvation. Nothing will ever replace that need for mankind because no matter how we rationalize, we are still sinners in need of God’s grace.