All that demands of you as a writer is wordplay or punning. Once you come upon this, it necessitates of you is a nice arrangement of words and synthesized sentence structures. I do not say writing is more creative or inventive. Speaking has an art too, and of course it is tougher but writing has an edge over speaking or delivering discourses in that writing can be edited and enhanced in due course. I do not admit that discourses are less artistic, emphatic or shallower. No. if we listen to some great orators orating we find them highly moving, yet it writing that survives discoursing. Indeed one needs more skills and promptness and quickness of mind in discoursing in point of fact. It is instants and prompt. Yet orators could not immortalize the way writers could in the course of time. There were great orators in the past but history did not chronicle them the way they chronicled the writers.