For whosoever will save his life shall lose it: and whosoever will lose his life for my sake shall find it.
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Theophylact of Ochrid
He exhorts us to confess Christ even at the cost of a martyr’s death. For he who denies Christ, finds his life in the present, that is, he saves his own life, but he also loses it later. But he who confesses Christ as a martyr, loses his life, but for Christ’s sake, and so he "shall find it" incorrupt and eternal.