Bosatsuken (菩薩拳, Bosatsuken; literally: "Bodhisattva Fist") is a special fighting technique from the Nadashinkage-ryu martial art.
Bodhisattva is the spirit of compassion invoking it involves letting ones opponent come at them without worry or fear like a prayer for their benediction then using all of ones body and soul to stop them right in their tracks. A strike without a fist, a will without an intention, no fist, no intention that’s the spirit. In short a mental state without a mental state.
The heart of Bodhisattava is merciful. His decaying punch is alive in the mortal realm. User must renounce their defense they must not fear or hide from opponent’s attack, even before death they must not flee but instead pray for their attacker with compassion and know when to receive, in their body and soul. This is the spirit of Bodhisattava and the technique's philosophy.
The Fist of Bodhisattva is a desperation technique aimed at the "suigetsu" point (heart) used to spring up life in the heart in order to kill it. A technique of sacrifice that requires one give up their guard user accumulates strength, by using both arms and the tension of the muscles at their paroxysm. This makes it very difficult to hit the vital point. On top of that, like all techniques that emit energy from the body, the amount of effort required is incalculable. Stretching out your effort leads to the contraction of the muscles, and this contraction diminishes half of your ability to maneuver hitting then just becomes impossible. But even when you’ve given up to your death your spirit will continue on. That is the state of conscience of the Bodhisattva.