Knowledge in war is very simple, being concerned with so few subjects, and only with their final results at that. But this does not make its application easy.

Wars are Spinach. Life in general is the tough part. In war all you have to do is not worry and know how to read a map and co-ordinates.

The most complicated skill is to be simple.

Simple can be harder than complex

The art of war is simple enough. Find out where your enemy is. Get at him as soon as you can. Strike him as hard as you can, and keep moving on.

Simplicity is not a simple thing.

how difficult it is to be simple

It is far more difficult to be simple than to be complicated

To be simple is no small matter.

Simplicity is the most difficult thing to secure in this world; it is the last limit of experience and the last effort of genius.

Everything is simpler than one can imagine, at the same time more involved than can be comprehended.

Everything must be made as simple as possible. But not simpler.

Action in war is like movement in a resistant element. Just as the simplest and most natural of movements, walking, cannot easily be performed in water, so in war it is difficult for normal efforts to achieve even moderate results.

Simplicity is the most difficult of all concepts.