Second Soliloquy

 Macbeth's hallucinations of the dagger leading him to Duncan’s chamber seem to boost Macbeth's wicked motivations. He begins to muse about dark imagery and that somehow he, the unlikeliest sap for killing a king, is in tune with them,  

Now o'er the one half-world
Nature seems dead, and wicked dreams abuse
The curtained sleep. Witchcraft celebrates
Pale Hecate’s offerings, and withered murder,
Alarumed by his sentinel, the wolf,
Whose howl’s his watch, thus with his stealthy pace,