Sentence:  Whatever you do, you need <WSD>courage</WSD>. Whatever course you decide upon, there is always someone to tell you that you are wrong. There are always difficulties arising that tempt you to believe your critics are right. To map out a course of action and follow it to an end requires some of the same <WSD>courage</WSD> that a soldier needs. Peace has its victories, but it takes brave men and women to win them. 
Meaning of the word marked with <WSD> tags:  The ability to maintain one's will or intent despite either the experience of fear, or the occurrence of adversity, frustration, defeat or reversal.