Associate with people who are likely to improve you.

Lucius Annaeus Seneca — known as Seneca the Younger — was a Stoic philosopher, statesman, and dramatist who lived in first-century Rome. Though he served as an advisor to Emperor Nero, Seneca’s personal writings focused on the quiet work of self-mastery. His Moral Letters to Lucilius form one of the cornerstones of Stoic philosophy: practical, direct, and deeply human reflections on how to live well in an unpredictable world.

This line comes from one of those letters, where Seneca advises his friend Lucilius to be intentional about the company he keeps. To Seneca, personal development wasn’t an individual pursuit but a social one. Our companions shape our thoughts, test our patience, and either raise or lower our moral temperature. He saw friendship not as convenience or entertainment, but as a mutual commitment to virtue — an alliance for becoming wiser and stronger together.

Modern psychology echoes this. Studies on social contagion show that emotions, habits, and even levels of ambition spread through close networks. The people you interact with daily subtly calibrate your expectations for yourself. When you spend time around cynicism, you adopt its posture; when you spend time around optimism and discipline, those traits slowly imprint on you.

Seneca’s wisdom invites a personal audit: not from a place of judgment, but awareness. The question isn’t who’s “good” or “bad,” but who brings out your best instincts — and who coaxes out your worst. It asks whether your friendships, workplaces, and routines align with your growth or erode it through distraction and mediocrity.

Choosing better company can mean gravitating toward mentors, colleagues, or communities that elevate your curiosity and integrity. It can also mean being that uplifting force for others — improving yourself not just for your own sake, but because your conduct subtly improves everyone it touches.

“The wise man improves himself by benefiting others,” Seneca also wrote, “and benefits others by improving himself.”

The exchange is reciprocal. Surround yourself with those who sharpen your mind and expand your capacity for good, and you, in turn, become the kind of person others seek to grow beside.

Who in your life consistently challenges you to think deeper, act truer, and live with greater discipline or compassion?

Where might you be spending time with people who drain your focus or lower your standards?

Reflect on how you can create an environment — of friends, colleagues, and mentors — that acts as soil for your better nature to grow.