Nothing, not even the best ...

Nothing, not even the best and noblest, can go on as it now is. Nothing, not even what is lowest and most bestial, will not be raised again if it submits to death. It is sown a natural body, it is raised a spiritual body. Flesh and blood cannot come to the Mountains [heaven]. Not because they are too rank, but because they are too weak. What is a Lizard compared with a stallion? Lust is a poor, weak, whimpering whispering thing compared with that richness and energy of desire which will arise when lust has been killed.
Nothing, not even the best and noblest, can go on as it now is. Nothing, not even what is lowest and most bestial, will not be raised again if it submits to death. It is sown a natural body, it is raised a spiritual body. Flesh and blood cannot come to the Mountains [heaven]. Not because they are too rank, but because they are too weak. What is a Lizard compared with a stallion? Lust is a poor, weak, whimpering whispering thing compared with that richness and energy of desire which will arise when lust has been killed.
 C. S. Lewis

Quotes from the same author

The central Christian belief is that Christ's death has somehow put us right with God and given us a fresh start. Theories as to how it did this are another matter. A good many different theories have been held as to how it works; what all Christians are agreed on is that it does work.
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 C. S. Lewis
Kids like us don't often have the chance of meeting a great warrior like you. Would you have a little fencing match with me? It would be frightfully decent.
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 C. S. Lewis
Emeth came walking forward into the open strip of grass between the bonfire and the Stable. His eyes were shining, his face was solemn, his hand was on his sword-hilt, and he carried his head high. Jill felt like crying when she looked at his face. And Jewel whispered in the King's ear, "By the Lion's Mane, I almost love this young warrior, Calormene though he be. He is worthy of a better god than Tash.
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 C. S. Lewis
You will not find the warrior, the poet, the philosopher or the Christian by staring into his eyes as if he were your mistress: better fight beside him, read with him, argue with him, pray with him.
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 C. S. Lewis
The poison was brewed in these West lands but it has spat itself everywhere by now. However far you went you would find the machines, the crowded cities, the empty thrones, the false writings, the barren beds: men maddened with false promises and soured with true miseries, worshipping the iron works of their own hands, cut off from Earth their Mother and from the Father in Heaven. You might go East so far the East became West and you returned to Britain across the great Ocean, but even so you would not have come out anywhere into the light. The shadow of one dark wing is over all Tellus.
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 C. S. Lewis