Language poisons through repetition, not persuasion
Klemperer argues that Nazism entered people less through speeches, pamphlets or explicit doctrine than through single words, idioms and sentence patterns repeated millions of times until they were absorbed mechanically. Words act like tiny doses of arsenic: they are swallowed unnoticed, seem to have no effect, and then after a while the toxic reaction sets in. Because the speaker adopts the form without examining it, the ideology comes along without ever being argued for.