Identifying Metaphor in Motivational Context

Read the following excerpt from a motivational speech:

“As we strive for greatness, we must remember that obstacles are not barriers but stepping stones. Each challenge we face builds resilience and fortitude. Let us embrace these trials as opportunities for growth and transformation.”

In this excerpt, the speaker utilizes various rhetorical strategies to motivate the audience. Which rhetorical strategy is primarily used in the phrase “obstacles are not barriers but stepping stones”?