Procrustean law
a belief
adage
aphorism
apophthegm
apothegm
article of faith
axiom
brocard
byword
canon
cliche
code
commandment
commonplace
convention
criterion
dictum
doctrine
dogma
enthymeme
epigram
form
formality
formula
formulary
general principle
gnome
golden rule
guideline
guiding principle
imperative
large
law
law of nature
mitzvah
moral
mot
motto
norm
norma
order of nature
ordinance
platitude
precept
artificer
discoverer
inventor
conception
creed
discourse
institution
morality
philosophy
prejudice
proposition
proverb
saying
sentiment
tenet
tradition
wisdom
writing