Final answer:
The quote by Patrick Henry reflects the principle of 'No taxation without representation', which became a rallying cry against British control and was pivotal to the American Revolutionary War.
Step-by-step explanation:
The principle in the US Constitution that is best reflected in the quote by Patrick Henry is No taxation without representation. Patrick Henry, an influential figure in the Virginia House of Burgesses, strongly opposed the Stamp Act imposed by the British crown and asserted that Virginians were subject only to taxes levied by themselves or their representatives. His stance exemplified the broader colonial backlash against British policy and eventually contributed to the Revolutionary War, highlighting one of the core disputes leading to the demand for American independence.