The Trilemma argument states that if the Biblical statements about Jesus are taken seriously, then Jesus can only be thought of as Lord, Liar, or Lunatic.
Despite its limitations of directly proving that Jesus Christ is God ultimately, this argument does show that that conclusion is the only Biblical one. For example, in a conversation with an unbeliever who thinks that Jesus was only a good man and nothing more, one could use this argument to show that He could not be merely a good man according to the Bible. It can be used to "open one's eyes" to acknowledging the bare truth that the gospel writers have expressed about Jesus.
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