Here's a red letter explanation. We need to get away from the thorns and find good ground.

Mark 4:18-19
Now these are the ones sown among thorns; they are the ones who hear the word,
and the cares of this world, the deceitfulness of riches, and the desires for other things entering in choke the word, and it becomes unfruitful.
Bible Gateway link: Mark 4:18-19