Identifying Paradox and Oxymoron

Read the following passage and analyze the use of paradox and oxymoron within it:

In her famous poem, the line “I must be cruel only to be kind” illustrates the complexity of human nature, where a seemingly contradicting statement might reveal a deeper truth. An additional example occurs in the phrase “deafening silence,” where two opposing concepts are juxtaposed to convey a profound emotional experience.

Which of the following lines best exemplifies the use of paradox or oxymoron similar to those mentioned?