Which words in this quote about personal essays from author barry lopez are examples of oxymoron?

it is, i think, the rarest of leisure, hard work mixed with hard pleasure, to refine one's time of deep thought or light regard into the utterly self-absorbed and equally and abundantly outward-seeking shape of the personal essay—a story comprised of found fact, of analyzed emotion, of fictive memory.

a. hard work
b. hard pleasure
c. deep thought
d. outward-seeking