It is the same rain which falls upon the rock, as upon the soil at its base, but the rock remains barren, while the soil becomes fruitful. Is, therefore, the rain at fault, or is the result due to the nature of the soil?
So the Word of God falls upon different hearts, and some continue barren and unfruitful, while others yield fruit a hundredfold. The fault lies in the hardness of heart of the hearer.