The seed (the Word of God) is perfect. But the soil (our hearts) is the issue. For where our treasure is, there our heart will be. We can give our physical ears to hear the Word but with a callous heart. If we don't truly value understanding the truth, the knowledge of the secrets of the Kingdom will be hidden. And every seed of truth will be tested in our lives before it can bear fruit. Scripture reference: Matthew 13:3-23