People who talk to themselves tend to solve more complex problems by making sense of their thoughts out loud.

自言自语的人往往会通过大声说出自己的想法来解决更复杂的问题。

So, going back to the sentence, we have " Silence" – that is, not making any sound or noise – " is only frightening" – is only scary – " to people who are compulsively verbalizing" – that is, who can't resist saying their thoughts out loud.

所以，回到这句话， 我们有“沉默” ——也就是说，不发出任何声音或噪音——“只是可怕的” ——只是可怕的——“对那些强迫性语言的人” ——也就是说， 谁不能拒绝大声说出他们的想法。