"Quien no extraña a la Unión Soviética no tiene corazón. Quien quiere que vuelva no tiene cerebro."

Simplified Meaning:

This quote suggests that feeling nostalgic or sentimental about the Soviet Union is understandable—we can appreciate and miss the good things that existed during that time, like a sense of community or certain social protections. However, wanting to go back to that system isn't wise because it had many serious problems, such as lack of freedom, economic issues, and political oppression. For example, imagine an old friend who you had fun times with but who often got you into trouble. You can miss the good times without wanting to relive all the bad consequences. In everyday life, this means we should learn from the past, cherish the positive memories, but also recognize the need for progress and not wish to return to flawed systems. It's a balance of emotions and practicality; appreciating what was good, while still moving forward intelligently.