Final answer:
The poem uses antithesis to contrast superficial appearances with deeper truths, emphasizing the hidden strength and potential that lie beneath the surface.
Step-by-step explanation:
The poem presents several instances of antithesis that highlight contrasts between appearances and underlying realities. For example, the first two lines "All that is gold does not glitter, Not all those who wander are lost;" contrast the value assigned to things that shine outwardly with the less obvious value of things that don't. Similarly, the lines "The old that is strong does not wither, Deep roots are not reached by the frost;" speak to the hidden strength and resilience that endures beyond superficial weakness or decay. This motif continues throughout the poem, emphasizing the power that lies dormant or hidden, ready to be revived or rediscovered, such as a fire from ashes or a renewed blade.