John Chrysostom — as excerpted in the Catena Aurea on Luke 8:4-15

“(Hom. 44. in Matt.) For as the thorns do not let the seed grow up, but when it has been sown choke it by thickening round it, so the cares of this present life permit not the seed to bear fruit. But in things of sense the husbandman must be reproved who would sow amid thorns on a rock and the way side, for it is impossible that the rocks should become earth, the way not be a way, the thorns not be thorns. But in rational things it is otherwise. For it is possible that the rock should be converted into a fruitful soil, the way not be trodden down, the thorns dispersed.”