Answer :
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 indicates that Patrick Henry believed in the strength and capability of the colonists due to the significant number of people (three million) willing to fight for liberty. He also highlights the advantageous nature of the country they inhabit, suggesting that with the right use of their resources and determination, they can overcome any force sent by the British.
Henry's belief in the colonists' strength, unity, and the divine support he mentions in the passage all contribute to his confidence in their ability to engage in armed resistance against Britain. This conviction is crucial as it motivated the colonists to stand up for their rights and ultimately played a role in the American Revolutionary War.