Summary
This episode is about priorities.
Are spiritual matters important to us, or do we allow the concerns of this life to take precedence? Consider the parable of the sower on this:
Matthew 13:22
As for what was sown among thorns, this is the one who hears the word, but the cares of the world and the deceitfulness of riches choke the word, and it proves unfruitful.
Matthew captures Jesus's response to a scribe and to another disciple; Luke adds one interaction to the list. Jesus responds with teaching about priorities to each of the three who were to follow Him.