John Gill Bible Commentary

And some fell upon a rock,.... Which the other evangelists call "stony places", and "stony ground"; by which are meant such hearers whose hearts are, hardened through the deceitfulness of sin, and continue so notwithstanding the preaching of the word unto them. And as soon as it sprung up; as it did immediately, as the other evangelists say; and that for this reason, which they give, "because it had no depth of earth"; only a small crust, or shell of earth over the rock; and signifies, that these hearers had only a superficial knowledge of the word, and hastily made a profession of it, which soon came to nothing: it withered away, because it lacked moisture; the other evangelists say, "when the sun was up, it was scorched"; meaning tribulation and persecution, the grace of God being wanting to support under fiery trials: the reason given in Matthew and Mark why it withered, is, because it had no root; and so read the Persic and Ethiopic versions here.