Logos is one of the three pillars of argument in classical Greek rhetoric. To be effective arguments must appeal to emotions (pathos), credibility (ethos), and logic (logos). Logos consist of the facts and statistics that give an argument backbone.
Patrick Henry appeals primarily to pathos or emotional appeals in his speech, using heightened language to incite emotions, but he does also use logos.
One example is when he asks:
Has Great Britain any enemy, in this quarter of the world, to call for all this accumulation of navies and armies?
He is using a rhetorical question (one that has only one possible answer) to imply that Britain's intentions toward to colonies are hostile and aggressive. Logically, there can be no other reason for England to send armed forces across the sea.
Henry also questions those who argue the colonies must not fight Britain because they are too weak. He asks when they will be stronger than they are now:
But when shall we be stronger? Will it be the next week, or the...
(The entire section contains 4 answers and 951 words.)