The Bible speaks of the Word of God as added. Sometimes it's planted by the wayside, and nothing grows there. Sometimes it's sown among the thorns and represents the person who makes the decision an then goes back to his old life of bars and chasing women or whatever. A third seed is sown among the rocks. There's sand and dirt between the rocks, and when it rains you'll see a stalk of green coming up. But on the first day with sunshine it wilts because there is no room for roots.The fourth seed is planted on fertile soil, and finally it takes hold and has a chance to grow and live. That's what happened to me.