But, as we have seen, many people try to conceal their poverty of thought under a flood of verbiage.

[Aber freilich suchen viele Schriftsteller gerade unter dem Wortüberfluß ihre Gedankenarmuth zu verbergen.]

Arthur Schopenhauer (1788-1860) German philosopher

Parerga and Paralipomena, Vol. 2, ch. 23 “On Authorship and Style [Über Schriftstellerei und Stil],” § 283 (1851) [tr. Saunders (1890)]
    (Source)

(Source (German)). Alternate translation:

But, truly, many authors try to hide their poverty of thought under a superfluity of words.
[tr. Dircks (1897)]