Everything can collapse. Houses, bodies, and enemies collapse when their rhythm becomes deranged. In large-scale strategy, when the enemy starts to collapse you must pursue him without letting the chance go. If you fail to take advantage of your enemies' collapse, they may recover. Miyamoto Musashi
Progress is the product of human agency. Things get better because we make them better. Things go wrong when we get too comfortable, when we fail to take risks or seize opportunities. Susan Rice
If you fail to take away a strong man's sword when he is on the ground, will you do it when he gets up? Nigerian Proverb