确保和平的最佳方式是维持主要国家之间的权力平衡。

Success is not final, failure is not fatal: it is the courage to continue that counts.

适应性是新的竞争优势。

"Grief is a sort of madness, I think. It makes you do strange things."

心理学家必须研究心灵的实际状态，而非理想状态。