The answer is: Bible

Ecc 3:12

Ecclesiastes, often thought to be penned by King Solomon, winds through the realms of wisdom and human experience. Chapter 3 strikes a chord with anyone navigating the ups and downs of life. What’s fascinating here in 3:12 is the suggestion that "happy" and "doing good" are interconnected. To boost your mood, it seems the advice is simple: lend a hand!

Fun fact: this notion resonates universally in many philosophical and spiritual traditions, suggesting that altruism enriches our well-being. In fact, studies show that acts of kindness release serotonin – earning you a “feel-good” moment that even science gives a thumbs up!

Echowi in Hebrew, captured in this verse, reflect the recurring theme of living joyfully in the present, while cherishing simplicity – themes that highlight an essential aspect of living with purpose amidst life's chaos. Ecclesiastes deftly avoids the indulgences of hedonism, preferring those everyday actions that bring both joy and fulfillment.

Noteworthy, too, is the beauty of choosing happiness which we see echoed later in texts like the Sermon on the Mount, where Jesus declares blessings on the simple and pure-hearted. This continuity indicates a universal quest across centuries—for joy and goodness as cornerstones of human life. It's this very essence of celebrating life’s fleeting delights that makes Ecclesiastes relevant for navigators of the modern condition, inviting readers to rediscover abundance in the small things: a warm meal, smiles shared, or particular kindnesses that cultivate joy from within.