Doyle Brunson and Bold Face Words

[Macedon]

Super System, Page 458:

" In brief ... you don't give free cards where that free card could break you. If there's a possible Straight or Flush draw on Board...you don't give a free card. "

So what exactly is he emphasizing here?

In one paragraph later he makes every single word bold faced except for the word "not".

Interesting use of the bold type.