John F. Kennedy highlighted the challenges of negotiating with individuals or groups that adopt a rigid stance regarding ownership and entitlement. This quote suggests a significant barrier in discussions where one side believes they hold exclusive rights to their possessions while considering the other’s property as open for debate. Such an approach leads to an impasse in negotiations, making it difficult to reach a consensus or mutual agreement.

The essence of Kennedy's observation underscores the importance of fairness and reciprocity in negotiations. When one party is inflexible, the possibility for constructive dialogue diminishes, often resulting in conflict or stalemate. Successful negotiations typically require an understanding that both sides must be willing to engage in give-and-take, fostering a climate where each party’s interests are acknowledged and valued.