Final answer:
Thomas Paine uses the rhetorical feature of contrast to emphasize that great sacrifices lead to a sweeter sense of freedom, valuing it more when it is hard-won.
Step-by-step explanation:
The rhetorical feature used by Thomas Paine to convey the theme that great sacrifices yield sweeter freedom is contrast. Paine emphasizes the difficulty of overcoming tyranny and the associated value of freedom that comes at a high cost. By contrasting easiness with difficulty and cheapness with dearness, he makes the point that the things we strive hardest for are the most valued, specifically freedom. Additionally, Paine leverages metaphor by likening tyranny to hell and commenting on the 'price' set by Heaven for its goods, which includes freedom, suggesting that the divine value placed on freedom necessitates a corresponding struggle to achieve and appreciate it.