But remember, darkness does not always equate to evil, just as light does not always bring good.
from Marked by P.C. & Kristin Cast
The antithesis within the sentence contrasts the balanced phrases while, at the same time, use them as a comparison of similarities to help Zoey, the main character, relate darkness to her knowledge of light in her initial life.
And think, wealth does not always lead to happiness, just as poverty does not always create sadness.