You cannot know if you will be successful or not. You can only prepare for battle and it must be done with all of your heart and with all of your consciousness. In that manner, you will have an edge.

If the enemy opens the door, you must race in.

The Art of War is self-explanatory

And therefore those skilled in war bring the enemy to the field of battle and are not brought there by him.

The consummate leader cultivates the moral law, and strictly adheres to method and discipline; thus it is in his power to control success.

Apparent confusion is a product of good order; apparent cowardice, of courage; apparent weakness, of strength.

Hold out baits to entice the enemy. Feign disorder, and crush him.