By St. Theophan the Recluse  
The mind can prove the truth of the
  Resurrection through reason based on the Scriptures, and a
  non-believer cannot but admit the power of its arguments,
  as long as a sense of truth is not yet dead in him. A
  believer does not need proof, because the Church of God is
  filled with the light of the Resurrection. Both of these
  indicators of truth are faithful and convincing. But
  counter-reasoning can spring up and contradict
  mind’s reason, and faith can be trampled and shaken
  by perplexities and doubts, coming from without and
  arising within. Is there no invincible wall around the
  truth of the Resurrection? There is. It will occur when
  the power of the Resurrection, received already at
  baptism, begins to actively be revealed as it purges the
  corruption of soul and body, and establishes within them
  the beginnings of a new life. He who experiences this will
  walk in the light of the Resurrection, and anyone talking
  against the truth of the Resurrection will seem to him
  insane, like a person saying in the daytime that it is
  night.
