According to the text, what must one often do to achieve happiness?

Achieving happiness often requires an individual to change their thoughts and actions. This concept is rooted in various philosophical and psychological traditions that emphasize the importance of mindset in determining one's emotional state. By altering negative thought patterns and engaging in positive actions, one can foster a more content and fulfilling life.

For instance, cognitive-behavioral therapy, a widely recognized psychological approach, highlights how changing specific thought processes and behaviors can lead to improved mental well-being. When a person actively works on their internal dialogue and external behaviors—such as practicing gratitude, setting achievable goals, and cultivating positive relationships—they are more likely to experience genuine happiness.

This idea stands in contrast to the other options. Seeking wealth and power may offer temporary satisfaction but doesn’t guarantee lasting happiness. Following societal trends might lead to conformity rather than genuine fulfillment. Isolating from negative influences can be beneficial, but it doesn't address the foundational work needed in transforming one's thoughts and actions to cultivate authentic happiness. Thus, the necessity of internal change is crucial for fostering a sustainable sense of well-being.