Is there a difference in value of a work that is written as opposed to one that is orally expressed? Once an argument or articulation is written down on paper does it lose some of it's worth?
Socrates uses an analogy that relates serious farming (as opposed to farming for the sake of amusement) to dialectical expression (as opposed to written speeches, which are also merely for the sake of amusement):
Now, tell me this. Would a sensible farmer who had some seeds he cared about and who wanted to produce a crop plant them with serious intent in the heat of summer in gardens for Adonis and enjoy seeing them bloom beautifully in eight days? If he did such things at all, wouldn't he do them for the sake of amusement and at festivals? In those cases where he was serious, wouldn't he use the farmer's art and plant in suitable ground and prefer having what he has sown reach maturity in the eighth month?... Shall we say that the person who has a knowledge of what's just, beautiful, and good is less sensible about his seeds than the farmer?... Then, when he's serious he won't write them in ink, using a pen to sow speeches that are unable to defend themselves in discussion and unable to teach truth effectively... He'll sow his gardens for amusement, it seems, and will write, when he does write, to store up reminders for himself, and for all who follow the same track, against the forgetfulness that may come with old age. (276b-276d)
Socrates makes it clear that speeches which are written down cannot possibly attain as much value as oral ones because they cannot be "implanted" or understood by the reader nearly as well. He relates writing speeches to farming for "the sake of amusement and festivals" because he says the only purpose for one to write it down is for "reminding", because one who truly has knowledge of things like "goodness" and "justice" has no need to write them down.
I would like to disagree with Socrates.
I think that putting something in writing is ballsy and it exhibits knowledge just as well as oral speech does. I think that writing is just as capable of affecting the audience as dialect is. In fact, I think that one can show "seriousness" in writing even more so than in dialect. This is because someone has to make the effort to actually put down what they want to express rather than just simply saying it. When something is in writing, it is out there for multiple people or even for the whole world to see. Something you say can be heard by others for that instant, but when something is in writing it is out for the world and can rarely be taken back.
Socrates also relates writing to painting, in that the "[c]reations stand there as though they were alive, but if you ask them anything, they maintain a quite solemn silence... they always just continue to say the same thing... it isn't able to help or defend itself" (275 e). He complains about the value of these works and says that these forms of art are less purposeful perhaps because they are not directed towards a specific person for a specific reason, in order to teach or change them. Instead, they are spread and shared equally among everyone, people who have no true reason to see them. This is another reason I think writing is just as powerful as oral speech, BECAUSE it has no one to defend it; the creator puts it out there for the world regardless of the many various interpretations, hoping it will reach and change them. The writer is put in a position that is able to make them feel much more vulnerable than the speech giver.
I do not believe writing, like planting for "festivals", is purely for amusement. I believe it is very important, not only in building history but in changing the world and the people in it. Any art in written or frozen form is powerful.