Final answer:
Patrick Henry believed that the colonists' resources were adequate for armed resistance against Britain.
Explanation:
The sentence in the excerpt that suggests Patrick Henry believed the resources available to the colonists were adequate for armed resistance against Britain is:
"Three millions of people, armed in the holy cause of liberty, and in such a country as that which we possess, are invincible by any force which our enemy can send against us."
This sentence conveys Henry's conviction in the strength and capabilities of the colonists when properly utilizing their resources.
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