I often say to my assistants, "Never trust anybody," but what I mean is that you should never trust someone else to do a job exactly the way you would want it done.

never trust the words of a man who is not free.

Never trust anyone who has not brought a book with them.

Never believe all you hear or read about anyone.

One must never trust the occasion when one is without difficulties.

never trust a man who won't accept that there is more than one way to spell a word

Paraphrased

Never trust anybody with only one book.

Never trust a man who thinks his religion gives him all the answers.

Truth can never be told so as to be understood, and not be believed.

[N]ever trust a German when he tells you he's an atheist.

Truth can never be told so as to be understood and not be believed.

Never act in breach of trust.

Never trust the advice of a man in difficulties.

Don't trust anybody who'd rather be grammatically correct than have a good time.