Some of the seed landed among the weeds. The weeds competed for the life giving resources and the seed did not have what was necessary to thrive.
We are designed by God to survive, thrive and conquer. But like the human body, the human spirit requires numerous types of input to achieve optimal health. Strength and energy are depleted when these inputs are blocked. or diminished. The seed has no energy to grow.
The current cultural climate offers a multitude of things that can draw us away from a living, feeding connection with God. There are sinful indulgences. There are distractions. There are good and innocent things that when practiced and given proper priority can enhance our spiritual connection, but when given improper priority detract and hinder growth.