By St. Theophan the Recluse 
There are certain individuals whom the
  holy fathers praise for their Christian lives, for they
  rose from the dead before the general resurrection. What
  is the secret of such a life? They mastered the
  characteristic features of a life according to the
  resurrection as they are shown in the word of God, and
  made them their own inner properties. The future life is
  devoid of all that is fleshly: there men neither marry,
  nor are women given in marriage, there they will not eat
  dead food, and they will receive a spiritual body. Thus,
  whoever lives estranged from all fleshly things receives
  in himself, or returns to himself, elements of the future
  life according to the resurrection. Reach the point that
  all fleshly things within you die, and you will be
  resurrected before the future resurrection. The apostle
  indicates the path to this when he says: "Walk in the
  Spirit, and ye shall not fulfill the lust of the flesh"
  (Gal. 5:16). And he attests that through this path it is
  surely possible to attain what is awaited: "He that
  soweth to the Spirit," he says, "shall of the Spirit
  reap life everlasting" (Gal. 6:8).
