"All things are ready if our minds be so." Henry V
Shakespeare's famous Saint Crispin's Day speech by Henry V speaks to the ultimate weapon we all have to fight the battles we face in business and in life, i.e. our minds.
Henry's men are outnumbered five to one and the enemy 'is fresh'.
When all seems lost Henry paints a picture so powerful in his soldiers' minds that their perspectives shift from one of almost certain loss to one of great victory no matter the outcome.