The best description of the rhetorical technique used by President Kennedy in the phrase “Let us never negotiate out of fear. But let us never fear to negotiate” is:
**The main idea of the second sentence contradicts the main idea in the first sentence, which demonstrates how dangerous it can be to let fear into a negotiation.**
This technique highlights the complexity of negotiating by emphasizing both the avoidance of fear in decision-making and the necessity of engaging in negotiation itself.