'The believer will fight another believer over a shade of difference: the doubter fights only with himself' - Graham Greene, Monsignor Quixote
Tuesday 26th April - Is is possible to know the truth without challenging it first?
Surely if it was the truth you would not challenge it? Thus I would say we 'think' we know the truth, but do not truly believe it to be the truth. If we did think it was the truth we would not question it. So the short answer to the question is, no.