"Taking now for granted that instability arises generally even in those cases in which the inviscid equation allows only a neutral solution, the question arises how viscosity can cause instability. From simple arguments one would expect damping rather than amplifying. But here one should remember that an inviscid fluid is a system of an infinite number of degrees of freedom, which normally interact so that the energy is dissipated among all modes of vibration. It is only for very special geometrical conditions that this transfer of energy does not take place. Therefore, if a neutral disturbance is possible in the inviscid fluid, the viscosity may easily change the phases of vibration in such a manner that the transfer of energy begins, which then means amplification of the vibration."
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Werner Heisenberg: (quote from p. 295)
https://en.wikiquote.org/wiki/Viscosity
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Viscosity
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