What does 套 mean in ...绝对没有一个规则套在这里...? This is 俞敏洪 speaking:


  这个问题两说，我建议想清楚了一件事情以后再去做，只要想清楚了，你就要不断往前， 只要资源允许，时间，能力没问题，你都要坚持去做。 这就和战争一样总是要看到当时当地的情况才能下决定，绝对没有一个规则套在这里，大家以后就不用去思考。


绝对没有一个规则[套]在这里
(there is) absolutely no rule/principle [hidden] in this,
(there is) absolutely no rule/principle [one can follow] here,
(there is) absolutely no rule/principle [applicable] here, 

I know of：
套用规则：apply a rule
自动套用：auto format

What does this 套 mean here?
My understanding is that 套 is short for 套用 here, meaning "apply mechanically".

Basically, the author conveys there isn't such a rule/principle that could work for all the circumstances, so that we don't have to worry once applying it.

With that in mind, I gather you should be able to wording it much better than I do as an English native. 

This is my shot:
(there is) absolutely no rule/principle fixing(or being applied) here, so we don't have to worry about it any more. 

On top of that, if the sentence is written as 绝对没有一个规则被套用在这里, would it be more understandable to you? In fact, it's a passive voice sentence with some omissions.