The Parable of the Sower

Several o f Jesus’ apostles recorded this parable.

A sower went out to sow his seed; and as he sowed, some fell along the path, and was trodden under foot, and the birds of the air devoured it. And some fell on the rock; and as it grew up, it withered away, because it had no moisture. And some fell among thorns; and the thorns grew with it and choked it. And some fell into good soil and grew, and yielded a hundredfold. (Luke 8:4-15)

Jesus hen explained that the seed in the parable was the word of God. In that case, what is the meaning of the parable?