When anyone hears the message of the kingdom but does not understand it, the evil one [i.e., the devil] comes to him and grabs away what had been sown in his heart. This is the person who was scattered to the side of the road.
Therefore, you should put away [from you] all moral filth and overflowing wickedness and humbly receive the word [of God], planted within you [by the Holy Spirit. See John 16:8], which is capable of saving your souls.
And those people [represented by the seed falling] along side of the road are those who have heard the word [of God], but the devil comes and takes away the word from their heart, so that they do not believe it and receive salvation.