'Stony' in the Bible

Some fell upon stony places, where they had not much earth: and forthwith they sprung up, because they had no deepness of earth:

But he that received the seed into stony places, the same is he that heareth the word, and anon with joy receiveth it;

And some fell on stony ground, where it had not much earth; and immediately it sprang up, because it had no depth of earth:

And these are they likewise which are sown on stony ground; who, when they have heard the word, immediately receive it with gladness;

Others fell on stony ground, and as soon as they came up, they dried up because they had no moisture.

The ones on the stony ground are the people who joyfully welcome the word when they hear it. But since they don't have any roots, they believe for a while, but in a time of testing they fall away.