The first type of soil that Jesus describes is soil that has been hardened by the treading of the world. The Sower throws seed on this heart soil, and it is instantly snatched away by Satan and never allowed to grow. Suffering of the world, sin in ourselves and from others, and the constantly treading of others has a hardening effect on our hearts. This ground needs love, care and attention to be softened, tilled and receptive to the new growth of the Kingdom of God.