The law, being an inherited accumulation, imposes itself on each generation willy-nilly. Any society whose members enter and leave it severally must for very convenience, to say nothing of deeper reasons, proceed by tradition; the neophyte must adopt existing habits and ways of acting, if for no better reason, through inexperience and diffidence. Mere custom will do the rest as he proceeds. And so the rule is canonized, its origins, and therefore its meaning, are ignored. But genuine learning is quite different.

"Mr. Justice Holmes at Eighty-Five" (1926).