Here is the J.C. Ryle's conclusion to the parable of the sower:
In the last place, let us learn from this parable, that there is only one evidence of hearing the word rightly. That evidence is to bear fruit.
The fruit here spoken of is the fruit of the Spirit. Repentance towards God, faith towards the Lord Jesus Christ, holiness of life and character, prayerfulness, humility, charity, spiritual-mindedness--these are the only satisfactory proofs that the seed of God's word is doing its proper work in our souls. Without such proofs, our religion is vain, however high our profession. It is no better than sounding brass and a tinkling cymbal. Christ has said, "I have chosen you, and appointed you, that you should go and bear fruit." (John 15:16.)
There is no part of the whole parable more important than this. We must never be content with a barren orthodoxy, and a cold maintenance of correct theological views. We must not be satisfied with clear knowledge, warm feelings, and a decent profession. We must see to it that the Gospel we profess to love, produces positive "fruit" in our hearts and lives. This is real Christianity. Those words of James should often ring in our ears, "Be doers of the word, and not hearers only, deluding your own selves." (James 1:22.)
Let us not leave these verses without putting to ourselves the important question, "How do WE hear?" We live in a Christian country. We go to a place of worship Sunday after Sunday, and hear sermons. In what spirit do we hear them? What effect have they upon our characters? Can we point to anything that deserves the name of "fruit?"
We may rest assured that to reach heaven at last, it needs something more than to go to Church regularly on Sundays, and listen to preachers. The word of God must be received into our hearts, and become the mainspring of our conduct. It must produce practical impressions on our inward man, that shall appear in our outward behavior. If it does not do this, it will only add to our condemnation in the day of judgment.