Sachi (happiness) in the old days was also written as 弓矢 (bow and arrow), and 'chi' in ikazuchi (thunder), mizuchi (mythical aquatic creature having a snake-like body with four legs and a horn) and inochi (life) all are considered to denote tamashii (spirit, soul) or spiritual power.
-幸（さち）も古くは弓矢とも表記し、雷（いかづち）・蛟（みずち）・命（いのち）の「チ」は全て、魂（たましい）や霊威を表すといわれている。