The answer is: Bible

Rom 12:9

This snippet from Romans, particularly Romans 12:9, serves as an essential foundation for how to lead a meaningful life that prioritizes integrity and authenticity. Paul, the writer of Romans, emphatically urges believers to embody love that is not merely performative but genuinely heartfelt. The verse encourages an abhorrence for evil while simultaneously advocating for strong attachment to goodness—reminding us that one cannot thrive without the other.

Paul’s teachings echo throughout the Bible, promoting the idea that love must carry weight and intent. For quite a dramatic illustration, recall the story of David, whose heartfelt lamentation for Jonathan, marked by true friendship, deeply contrasts with Saul’s treachery. True love—like David’s for Jonathan—is fated to recognize what detracts from connection and camaraderie.

There's also a cool linguistic link here: the original Greek term for "sincere" can connote a process similar to purifying metals, indicating that love must be tested and refined. An interesting fact is that this emphasis on authenticity not only can be found in early Christian writings but is a profound sentiment echoed in many spiritual traditions around the globe, highlighting a universal significance attached to genuine social interactions.

In essence, this verse nudges us toward a moral framework while charging us to navigate life powerfully spaces emphasizing not just tolerance, but affinity towards what fosters human kindness and authentic relationships. Embrace good, let love show its true colors, and deny treachery the weight it's sometimes so foolishly granted.