6.18

"The army's positioning should imitate water. Just as water avoids the high and rushes to the low, the army's positioning must avoid the full and strike the empty. Just as water follows the ground, which determines its flow, the army responds to the enemy, who determines its victory. Therefore, the army does not have constant force, just as water does not have constant form."
- Sun Tzu

This is probably one of the most important passages in Sun Tzu, which describes how he envisions the army. For Sun Tzu, formlessness does not mean the army should have no positioning. Rather, it means that its positioning is completely dependent on the enemy - on the enemy's strengths and weaknesses. And thus, its positioning is always changing according to the enemy.

The army should never attack where the enemy is strong, but always aim for where the enemy is weak - where he is least prepared, where he is fewest, where he is not expecting. This is the driving principle for Sun Tzu's strategy.

As it should be for you, as well. Never go into a situation with a pre-determined strategy or plan. Your first step must always be to study the situation, understand your options, and choose the option that allows you to move forward with the least amount of resistance.