-ist

third-person singular present of sein

trust, but verify (trust is not enough; verification is required)

speech is silver, silence is golden

Once doesn’t count; one swallow does not a summer make / One slip is allowed; everyone deserves a second chance / One time won’t hurt; just try it

no use crying over spilt milk. / what's done is done

less is more

to err is human

orders are orders (Used wrily when someone attempts to justify questionable actions by referring to rules, laws or orders from higher up.)

time is money