I'll just post a short answer question I responded to in year 12...
30. Analyse Richard’s soliloquy. How does he use language? How has Richard changed in this speech, and why?
Richard’s soliloquy in Act 5 Scene 3 essentially encapsulates the evolution of his character, alerting to the audience his frame of mind as the play reaches its denouement.
First and foremost, Richard’s soliloquy indicates the inner conflict he is experiencing prior to his final battle. The exclamation of “O coward conscience” is essentially emblematic of Richard’s primary struggle; following his murders, he is torn but the guilt he is experiencing, with lines such as “Alas, I rather hate myself for hateful deeds committed by myself” expressing an inability to continue his previous decision to “prove a villain”. Indeed, Richard’s falling back on his previous words is directly expressed, with the line “I am a villain! – yet I lie, I am not” suggesting the role is now something Richard cannot uphold. The internal conflict of Richard is also signified within the fractured nature of his dialogue, with lines such as “I love myself…Alas, I rather hate myself” “No! – yes, I am” signifying to the audience that Richard is arguing with himself. Shakespeare is hence constructing the very image of a disjointed and incoherent identity, unable to maintain its values in the face of its previous immorality.
Beyond this, the words expressed in Richard’s soliloquy also allow the audience to see Richard’s self-condemnation. As a result of his identity falling apart, Richard’s language expresses to the audience a sense of personal hatred; lines such as “My conscience hath a thousand several tongues/And every tongue brings in a several tale/And every tale condemns me for a villain” suggest an unrelenting self hatred, unable to accept the mess of villainy which Richard has fallen into. Richard’s invocation of legal terminology, such as “Murder, stern murder, in the dir’st degree!” furthermore forms the image of Richard as a criminal, condemned by the world’s justice for the evil nature of his actions. Finally, cries of “if I die no soul will pity me” relate to the audience Richard’s lack of support within the rule of his Kingdom; at the cusp of his defeat, Richard’s words echo the curses of Margaret and the Duchess, and what Shakespeare is establishing thus is that at the zenith of villainy comes the nadir of isolation, the final tragedy which precedes the denouement of Richard III.
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Basically, yes he does have a conscience, it's just hidden and supressed, and doesn't come into play at all until in act 5. I would also agree somewhat with JDog's reading: basically, Richard's ultimate destruction (and the manner in which his guilt tears him apart) seems to present conscience as a necessary force for humanity, and that ignorance of it, as seen in the case of Richard, can only be detrimental.