自由民主在世界范围内的传播并非不可避免，但它是历史进程中最可能的结果。
The spread of liberal democracy around the world is not inevitable, but it is the most likely outcome of the historical process.
Psychology must be grounded in the reality of the organism's struggle to exist.
Agriculture is the foundation of manufactures, since the productions of nature are the materials of art.
我不会说我完美，但我在尽力。
Great things take time.