The Principle of Polarity

An idea that is not dangerous is unworthy of being called an idea at all.
― Oscar Wilde

There is some danger and risk to all ideas.

Just as there is black in white, darkness in light etc. in everything.

Duality is everywhere. You can’t have one without the other.

“Everything is Dual; everything has poles; everything has its pair of opposites; like and unlike are the same; opposites are identical in nature, but different in degree; extremes meet; all truths are but half-truths; all paradoxes may be reconciled.”
― The Kybalion

Good and Evil are of the same pole.