We rode on the winds of the rising storm,
we ran to the sounds of thunder.
We danced among the lighting bolts,
and tore the world assunder.
You can never know everything, and part of what you know is always wrong. Perhaps even the most important part. A portion of wisdom lies in knowing that. A portion of courage lies in going on anyway.
Always assume your enemy will do what you do not want. Decide what you least want them to do, and plan on that.