Do not recognize friend or foe in your mind.
In your heart let there be generosity as large as the sea which accepts both clean and unclean water.
Let your mind be as merciful as nature which loves the smallest tree or blade of grass.
Let your mind be strong with sincerity that can pierce iron or stone.
Repay the forces of nature, work for the good of all and make yourself a person whom nature is pleased to let live.
This is the true purpose of training.
Koichi Tohei, "Aikido: The Arts of Self-Defense"