Distrust any impression given by fragmented quotations, be they text, audio, video.

(The mere existence of the phrase "out of context" reflects the danger of trusting these. Note, however, that this doesn't apply merely to quotes. To give an example I personally fell for: a false impression as to who said what in a 'documentary' about a psychic detective was given by rapidly cutting between the accounts of the officers working the case and the account given by the detective.)