nothing could be further from the truth -- used to say that it is NOT true
没有东西是离真理更远的了 = (除了你谈到的东西)没有东西是离真理更远的了 = 你谈到的东西是离真理最远的
类似的句子 Nothing could have been further from my mind/thoughts -- used to say that you certainly did not intend something:
I certainly wasn't trying to get money off him - nothing could have been further from my mind!
是说在这句之前所讲的内容是非常错误的。The previously expressed statement is utterly, utterly wrong. Usually said in a knowing fashion, generally to the detriment of whoever expressed the previous statement.