Some of the seed landed on rocky ground. There was some soil, and the seed germinated. But it could not put down roots, so it was scorched by the sun and died.
Often, God's invitation is accepted. Joy and delight soar to the clouds and bright sunshine. But in every life, dark clouds block the sun. God's original design for the world and people was corrupted. Life is not how God intended it. It is a battle ground and most people do not understand the fight. They expect God to defeat the source of the battle, and life in Christ to run as smooth as silk. God will totally defeat the enemy. But for a time, we will engage in battle with him. Those not prepared for battle will desert the army. Their expectations were not meet.