Charles Spurgeon Commentary Mark 1:19-20

"And going on a little further, he saw James the [son] of Zebedee, and John his brother, who also were in the boat mending the nets. And straightway he called them: and they left their father Zebedee in the boat with the hired servants, and went after him." — Mark 1:19-20 (ASV)

They never had cause to regret that they did so. Whatever they left, they were abundantly rewarded. They had a rich reward here on earth; and they have a far richer reward in heaven. Whatever a man gives up for Christ is a blessed investment, which will, sooner or later, bring him good interest.