Adam Clarke on Mark 1:39

And he preached - He continued preaching - Ην κηρυσσων: this is the proper meaning of the words: he never slackened his pace - he continued proclaiming the glad tidings of salvation to all - there was no time to be lost - immortal souls were perishing for lack of knowledge; and the grand adversary was prowling about, seeking whom he might devour. This zealous, affectionate, and persevering diligence of Christ should be copied by all his servants in the ministry; it is not less necessary now than it was then. Thousands, thousands of Christians, so called, are perishing for lack of knowledge. O God, send forth more and more faithful laborers into thy vineyard!