The seed sown on rocky ground is the one who hears the word and at once receives it with joy.

Matthew 7:8
For everyone who asks receives; he who seeks finds; and to him who knocks, the door will be opened.

Matthew 13:5
Some fell on rocky ground, where it did not have much soil. It sprang up quickly because the soil was shallow.

Matthew 13:19
When anyone hears the message of the kingdom but does not understand it, the evil one comes and snatches away what was sown in his heart. This is the seed sown along the path.

Matthew 13:21
But since he has no root, he remains for only a season. When trouble or persecution comes because of the word, he quickly falls away.

But he that received the seed into stony places, the same is he that hears the word, and immediately with joy receives it;