I think the effective use of quotation is an important point...

I think the effective use of quotation is an important point in the art of writing. Given sparingly, quotations serve admirably as a climax or as a corroboration, but when they are long and frequent, they seriously weaken the effect of a book. We lose sight of the writer - he scatters our sympathy among others than himself - and the ideas which he himself advances are not knit together with our impression of his personality.