If anyone thinks that Christians regard unchastity as the supreme vice, he is quite wrong. The sins of the flesh are bad, but they are the least bad of all sins. All the worst pleasures are purely spiritual: the pleasure of putting other people in the wrong, of bossing and patronising and spoiling sport, and back-biting, the pleasures of power, of hatred.
For there are two things inside me, competing with the human self which I must try to become. They are the Animal self, and the Diabolical self. The Diabolical self is the worse of the two. That is why a cold, self-righteous prig who goes regularly to church may be far nearer to hell than a prostitute. But, of course, it is better to be neither.
From Mere Christianity
Compiled in A Year with C.S. Lewis
Compiled in A Year with C.S. Lewis
Mere Christianity. Copyright © 1952, C. S. Lewis Pte. Ltd. Copyright renewed © 1980, C. S. Lewis Pte. Ltd. All rights reserved. Used with permission of HarperCollins Publishers. A Year With C.S. Lewis: Daily Readings from His Classic Works. Copyright © 2003 by C. S. Lewis Pte. Ltd. All rights reserved. Used with permission of HarperCollins Publishers.
It seems to this writer, that spiritual sin not only corrupts the practitioner, but also all those at whom it is directed or who are exposed to it. While the sins of the flesh seems to inflict most of its harm on the practitioner. Neither is good.
Rather than parsing the differences, let us commit to eliminating both. That commitment, followed through upon and made the foundation of our lives will lift us above both types of vices and will bring us to the place that God intended us to be. It will also ensure that when we fall to vice, we will be lifted up and made better for the experience when accept the truth, we repent and turn back to God.
Turning away,
Z gardener
Good Morning Garden 
This response from a fellow gardener. Thank you. Z
“He (C.S.L.) certainly has his moments. Good discernment, in two brief paragraphs.
Good follow-up too. There’s an aviation aphorism along the same lines: the three most useless things on the planet are the altitude above you, the runway behind you, and the empty space in the fuel tank. Amen. On we go.”