The worst military policy is to assault walled cities… if your commander , unable to control is temper, sends your troops swarming at the walls, your casualties will be one in three and still you will not have taken the city… Therefore the expert in using the military subdues the enemy’s forces without going to battle, takes the enemy’s walled cities without launching an attack.
— Sun-Tzu (4th century B.C)
In real life, the solutions to your problems will often be counterintuitive. Your gut instinct will be wrong. Your commonsense will be all-to-common. And your experience will fail you.
This is not an excuse to fall apart and become paranoid, distrustful of yourself. Rather, start training yourself to think outside of the box, to question your own answers critically, with reason, and devoid of emotion.
Your own mind is your greatest enemy. Emotions are the devil. Overcome them both.
Now go lift something heavy,