There is nothing irrational about a "jump", what is irrational is refusing to budge from wherever you happen to land. The process of deduction only unpacks what is already implicit in the premises, so jumps are necessary to provide something new for our critical faculties to act upon. The "jumps" are to knowledge what mutations are to evolution, and the growth of knowledge would not be possible without them.
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A criticism that can be brought against everything ought not to be brought against anything, because it cannot help us choose among alternatives.
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