By St. Theophan the Recluse  
Beneficial is the work of those who,
  using sensible reason, crush the enormous lie mustered
  against the truth of the Resurrection. Read and arm
  yourself with this reason; meanwhile, do not be too lazy
  to allow more and more space for the power of
  Christ’s Resurrection to enter into you. The more
  you do this, the more you will breathe the air of the
  Resurrection, and you will become quite safe from all the
  darts of the enemy, which are directed against this truth.
  You ask, what is needed for this? Nothing special: be the
  way you ought to be according to the vow you made in Holy Baptism, which is our resurrection. You spat on Satan and
  all his works? So continue to preserve yourself thus in
  relation to him. Did you unite yourself with Christ? Then
  abide with Him. The deeds of darkness and light are
  obvious. Flee from the former and make all diligence with
  the latter. But do this without any compromises, even the
  smallest, so that the norm of your life becomes the
  following: there is no communion of light with darkness,
  or of Christ with Belial (cf. II Cor. 6:15).
