Charles Spurgeon Commentary Mark 5:20

"And he went his way, and began to publish in Decapolis how great things Jesus had done for him: and all men marvelled." — Mark 5:20 (ASV)

How great things Jesus had done for him: and all men did marvel.

This is the kind of ready-made preacher whose service for his Lord is usually most effectual. The man who, though he has studied little on many points, yet knows by experience what the grace of God has done for him, and keeps to that one theme, and recounts the story with simple untrained eloquence, is the man who will do much for his Master, as we read here: all men did marvel. If he had plunged into deep doctrinal subjects, it may be that men would have ridiculed him; but since he spoke of what he did know, and told of the greatness and graciousness of God, all men did marvel.

And he departed, and began to publish in Decapolis –

In the ten little cities that were in that region: he departed, and began to publish in Decapolis –

And he departed, and began to publish in Decapolis how great things Jesus had done for him: and all men did marvel.

His testimony not only made men marvel, but it helped to prepare the people to welcome the Saviour when he returned to that region.