Any hand that you get married to is the most dangerous one.
It has taken me years to realize the wisdom of such a statement.
If we get AA and raise preflop from early position and get 5 callers, we're in big trouble if we get married to our hand. The only way we should ever see a river card is if it checks around on both the flop and turn. LOL Or if we flop top set, then it's okay to go with it.
Or say we get KK on the button, raise the blinds and both call... flop comes 678 with two spades and the SB leads out and BB raises... what do we do here? If we get married to our hand, we're probably in big trouble, especially when the turn is either 5 of spades or 9 of spades.
The point is... in no-limit holdem, ANY card combination can be dangerous depending on the flop cards and the action. Don't get married to your hand!! This one statement really improved my game once I realized the wisdom of it. Good luck at the tables!