心理学的方法必须是客观的，即使研究主观现象时也是如此。
The principle goal of education is to create men who are capable of doing new things, not simply repeating what other generations have done.
The leather industry must evolve or risk becoming obsolete.
The great end of life is not knowledge but action.
The strength of a building is not just in its materials, but in the spirit of the people who use it.
建筑的强度不仅在于其材料，还在于使用它的人的精神。
The camera is like a weapon; it's dangerous if you don't know how to use it.