Rather than summarizing an already brief, punchy set of words from the amazing Jurgen Moltmann, check out his essay "The Logic of Hell" for a strong argument for a form of universalism. He tackles the old argument (put forth strongly by CS Lewis) that there has to be a an eternal hell because we have free will to choose our eternal separation from God - who in turn must supposedly honor our decision of hell over unity with Christ. He reveals the dogmatic bullshit here, calling this kind of "logic of hell" a kind of atheism. Brilliant stuff.
Click HERE to read it.