August Wilhelm von Schlegel

Along with Coleridge, Schlegel is credited with having first introduced the notion of a Hamlet who is paralized by an excess of reflection.

The whole is intended to show that a calculating consideration, which exhausts all the relations and possible consequences of a deed, must cripple the power of acting; as Hamlet himself expresses it: --
     And thus the native hue of resolution
     Is sicklied o'er with the pale cast of thought;
     And enterprises of great pith and moment,
     With this regard, their currents turn aray,
     And lose the name of action.

  - von Schlegel, in The Romantics on Shakespeare, Penguin, London, 1992. p. 308

He has even gone so far as to say, 'there is nothing either good or bad, but thinking makes it so;' with him the poet loses himself here in labyrinths of thoutht, in which neither end nor beginning is discoverable.  - pp. 309-310.