Mark 4

"And these are the ones by the wayside where the word is sown. When they hear, Satan comes immediately and takes away the word that was sown in their hearts. These likewise are the ones sown on stony ground who, when they hear the word, immediately receive it with gladness; and they have no root in themselves, and so endure only for a time. Afterward, when tribulation or persecution arises for the word’s sake, immediately they stumble. Now these are the ones sown among thorns; they are the ones who hear the word, and the cares of this world, the deceitfulness of riches, and the desires for other things entering in choke the word, and it becomes unfruitful. But these are the ones sown on good ground, those who hear the word, accept it, and bear fruit: some thirtyfold, some sixty, and some a hundred.” vv.15-20

Read chapter 4.
This section explains the parable we read in the first part of the chapter.  We must make sure we don't interpret the interpretation but take what God has made clearer to us already.    Here we learn about the different kinds of soils being the different kinds of hearts in man as they hear the Word of God. We see there's the hardened heart where the word is rejected from the start.  Then we see the joyful heart and excitement when first hear the word but because of no depth are easily uprooted when hard times come.  Next there's the heart that grows with the word but also grows the things of this world and let it get choked out.  Finally the heart that hears the word of God and bears fruit from it.  May we all have this soil in our hearts!  When can you think of times your heart has been like each of the different soils?