'Seeds' in the Bible

"A farmer went out to sow his seed. As he was sowing, some seeds fell along the path, were trampled on, and birds from the sky ate them up.

The seed along the path are those who have heard and then the Devil comes and takes away the word from their hearts, so that they may not believe and be saved.

And the seed on the rock are those who, when they hear, welcome the word with joy. Having no root, these believe for a while and depart in a time of testing.

Give thought to the ravens; they do not put seeds into the earth, or get together grain; they have no store-houses or buildings; and God gives them their food: of how much greater value are you than the birds!