Chapter 10, Verses 25 and 26 - Sun Tzu

Regard your soldiers as your children, and they will follow you into the deepest valleys; look upon them as your own beloved sons, and they will stand by you even unto death. If, however, you are indulgent, but unable to make your authority felt; kind-hearted, but unable to enforce your commands; and incapable, moreover, of quelling disorder: then your soldiers must be likened to spoilt children; they are useless for any practical purpose.
~ from The Art of War, Giles translation ~

Go here to read the introductory post to the verses of The Art of War.