"If we cut up beasts simply because they cannot prevent us and because we are backing our own side in the struggle for existence, it is only logical to cut up imbeciles, criminals, enemies, or capitalists for the same reasons"

This quote by C. S. Lewis is a discourse on the suggestion of survival of the fittest. He is recommending that if we want to reduce up animals for our own advantage, then it is only sensible to do the very same to other people that are weak than us. He is indicating that if we are willing to benefit from those that are weaker than us, after that we need to want to do the very same to those that are extra effective than us. He is suggesting that we ought to not be discerning in our exploitation of those who are weak than us, however rather that we must be willing to make use of anyone who is weaker than us. This quote is a reminder that we ought to not be selective in our exploitation of those that are weaker than us, however instead that we should want to make use of any person that is weaker than us.