Need some help with homework on hamlet?

act 3: who said it, and what is he/she talking about?? 1) .....the dread of something after death... makes us rather bear those ills we have, than fly to others that we know not of. 2) do not forget.this visitation is but to whet thy almost blunted purpose. 3) o, my offense is rank, it smells to heaven; it hath the primal eldest curse upon't.... 4) o, i am slain! i would greatly appreciate the help thank you very much :)