very careful

 Questioner:  The Torah gives reshus for a doctor to perform medical work [based on the verse, “He will surely heal” – so I had once an argument with a learned man and he said that as far as the chachamim, the Gedolei hador - he told me like this, this was his argument – he said, “I would go along with them, I would accept their opinion in religious matters. But when it comes let’s say to sickness, I’d draw the line there.  The Torah gave the doctors the reshut to heal.” So it’s the same with politics, don’t you think?

Rav Miller: … Hashem said you have to listen in everything to the Gedolim. Only, they’re the ones to tell you to get healed - they tell you to go to a doctor. So there’s no question about drawing a line. If the Gadol tells you not to go to a doctor, then you don’t go. He won’t tell you that because Torah says that you should go. But there’s no such thing as drawing lines, because what a Gadol tells you, that’s our lives. Now, a real Gadol is very careful what he does and what he doesn’t tell you. Understand that. And that’s why on many things they don’t say because they have not yet found it necessary to formulate a policy. But don’t think that there are areas where a Gadol has a right to say and areas where he doesn’t have a right to say. A Gadol, a great man has a right to say on everything. Now this has to be hammered into our heads over and over again, for years and years until we get it into our heads. If we want to succeed in our lives, not only as Jews, if we want to succeed as human beings, we have to take guidance from people who are competent. And who is competent for the Jewish nation? The Gedolei Yisroel.”

[Emphasis mine]