The parable of the sower teaches us that the seed is sewn in all sorts of soil. Not just the good soil. When Jesus gave the sermon on the mount. He was sewing the seed in all sorts of soil. And it took root in a lasting way in the good soil.
The seed is the word of God. The Gospel is preached in all kinds of soil , that is the command..but it will only root in the soil that the has been tilled by the Holy Spirit to accept it