《明史·志·卷六十八》
二是训练胆量勇气，使军士明白起止进返以及上下统属、相互友好相互帮助的大义。
二曰练胆气，使明作止进退及上下统属、相友相助之义。
The second one is to train courage and courage, so that soldiers understand the righteousness of starting and stopping, advancing and returning, as well as subordination, friendship and mutual help.