"No, wisdom is knowing who to trust. Intelligence is knowing whom to trust...
I'm not an English native speaker - Is there any difference between both parts of the sentence? Google translator didn't help to figure it out"
Took me a few minutes to figure this out ;P... I'm not a grammar expert, but I *think* this is the point of the sentence...
Who is a subjective pronoun, so it's the subject of the verb. Whom is an objective pronoun, so it's the object of the verb. There are 2 verbs in the sentence, "knowing" and "trust". So, I *believe* it adjusts the order if I replace one or the other in either sentence and re-word it a bit?
If I were to break both sentences apart and use "who" with myself. The first sentence would still be "I know who to trust", but the second sentence would be "I trust who I know".
To me, it sounds like a bunch of grammatical hubbub to make someone feel smart though, profundity is not typically found in a sound byte.
I use the same technique as Wally for dealing with telephone salespersons.
Me: "Oh, that sounds really interesting! Could you hold on a moment whilst I turn down the gas on the vegetables / answer the door / let the cat out - she's desperate / etc."
Then I lay the phone down and leave them hanging on.