Sentence:  Only let your language match your subject, then it will be shapely and free; but take care all the time not to overwhelm your work in a <WSD>spate</WSD> of words to attain the fluency of Isaeus; and that it slip not out too freely, avoid the danger of Strada. 
Meaning of the word marked with <WSD> tags:  A river flood; an overflow or inundation.