Every question "runs in a vicious circle" because political life as a whole is an endless chain consisting of an infinite number of links. The whole art of politics lies in finding and taking as firm a grip as we can of the link that is least likely to be struck from our hands, the one that is most important at the given moment, the one that most of all guarantees its possessor the possession of the whole chain.

Collected works of V. I. Lenin (ed. 1927)