When your spouse/friend/business associate says they did (or didn't) do it. Accept their word with full faith that they are being honest. Then go through their cell messages to confirm they are true angels.
Origin: Russian proverb, "doveryai no proveryai" (trust, but verify)
So he comes home late from work and doesn't feel hungry.
...So what did you say?
What could I do? Said, "Okay Honey" then checked his messages after he went to sleep.
...Do you think?
Naw, I mean, naw. Trust, but verify ensures a happy relationship.
The split second of realization that you thought there was one more or one less stair while carrying a large, heavy object, usually helping one of your loser friends move for the fourth time this year. Said loser friend will always laugh himself to tears as you bleed from the knee and the elbow.