The pale cast of thought?

Question

can someone please explain this to me? It's from Hamlet's soliloquy in Act III Scene I. =[

Answer 1

Not having the play on hand, I hazard a guess it means that  his thoughts are intangible at a time when Hamlet (?) feels he needs definite advice.

Answer 2

The general idea of the phrase "pale cast of thought" in Shakespeare's Hamlet  is that the shadow of thought clouds a man's ability to act. Man is weak when faced with uncertainty.