Getting people to fight by ...

Getting people to fight by letting the force of momentum work is like rolling logs and rocks. Logs and rocks are still when in a secure place, but roll on an incline; they remain stationary if square, they roll if round. Therefore, when people are skillfully led into battle, the momentum is like that of round rocks rolling down a high mountain - this is force.
Getting people to fight by letting the force of momentum work is like rolling logs and rocks. Logs and rocks are still when in a secure place, but roll on an incline; they remain stationary if square, they roll if round. Therefore, when people are skillfully led into battle, the momentum is like that of round rocks rolling down a high mountain - this is force.

Quotes from the same author

You have to believe in yourself.
Can you imagine what I would do if I could do all I can?
The supreme art of war is to subdue the enemy without fighting.
“Victorious warriors win first and then go to war, while defeated warriors go to war first and then seek to win.”
“Let your plans be dark and as impenetrable as night, and when you move, fall like a thunderbolt.”