Definition:
Oxymoron is a significant literary device as it allows the author to use contradictory, contrasting concepts placed together in a manner that actually ends up making sense in a strange, and slightly complex manner. An oxymoron is an interesting literary device because it helps to perceive a deeper level of truth and explore different layers of semantics while writing.
Example:
Sometimes we cherish things of little value.
He possessed a cold fire in his eyes.