Jamieson, Fausset and Brown on Mark 4:19

19. And the cares of this world, and the deceitfulness of riches, and the lusts of other things entering in--or "the pleasures of this life" (Lu 8:14).

choke the word, and it becometh unfruitful--First, "The cares of this world"--anxious, unrelaxing attention to the business of this present life; second, "The deceitfulness of riches"--of those riches which are the fruit of this worldly "care"; third, "The pleasures of this life," or "the lusts of other things entering in"--the enjoyments in themselves may be innocent, which worldly prosperity enables one to indulge. These "choke" or "smother" the word; drawing off so much of one's attention, absorbing so much of one's interest, and using up so much of one's time, that only the dregs of these remain for spiritual things, and a fagged, hurried, and heartless formalism is at length all the religion of such persons. What a vivid picture is this of the mournful condition of many, especially in great commercial countries, who once promised much fruit! "They bring no fruit to perfection" (Lu 8:14); indicating how much growth there may be, in the early stages of such a case, and promise of fruit--which after all never ripens.