顽强的人成功的秘诀是什么？

What is the secret ingredient of tough people that enables them to succeed?

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顽强的人成功的秘诀是什么？

The answer is very simple.

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一些坚持己见，意志顽强的人，不易与人相处。

Some tough cookies can not get along well with others.

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And both Southerners and Northerners shared both the reality and the spirit of that westward movement.

而且南方人和北方人都有,西进运动的历练和顽强的精神

耶鲁公开课 - 美国内战与重建课程节选