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Whatever contributes to the preservation of life is good; all that destroys life is evil.

An evil life is a kind of death.

Everything has positive and negative consequences.

Life has no meaning unless one lives it with a will, at least to the limit of one's will. Virtue, good, evil are nothing but words, unless one takes them apart in order to build something with them; they do not win their true meaning until one knows how to apply them.

Some things must be good in themselves, else there could be no measure whereby to lay out good and evil.

If we're not compelled to gain a deeper understanding of good and evil, how can we make the world a better place? How can we find ourselves at the end of our lives and know that our lives were significant? Those things would be impossibilities.

There is such a thing as doing good that evil may come.