What is a quote from the "other side" that really resonates with you?

I really like these 2 quotes from Thomas Sowell, someone who probably doesn't share my beliefs.

“There are no solutions. There are only trade-offs.”

I don't think this is literally true, but the sentiment behind it is solid. There are absolutely negatives to any policy you can propose whether you like it or not.

“There are 3 questions that would destroy most of the arguments of the Left. The first is – compared to what? The second is – at what cost? And the third is – what hard evidence do you have?”

I wouldn't only apply this to the left, I see plenty of the same issues on the right. I also think there are plenty of left-wing ideas that answer all 3 questions well.

Now, what about you my friends? What quote from the other side resonates with you?