Choose whose mind you spend time in

Spend time with the best minds — living or dead — and guard against the rest pulling you down.

Why it works

Seneca treats reading the great thinkers as keeping the best possible company, available any time, and warns that lesser company quietly lowers your standards. Whom you spend mental and social time with resets what feels normal to you, raising or lowering your baseline without conscious effort. Choosing your inputs is often more effective than relying on willpower.

How to do it

1. Pick a few thinkers (in books or in life) worth genuinely keeping company with, and spend regular time there.
2. Audit the company — and content — that consistently leaves you smaller or more agitated.
3. Deliberately shift hours from the second toward the first.

Evidence

Aligns directionally with social-influence research showing behaviors, norms, and moods spread through ties and reset what feels normal. The causal magnitude is debated, and the "company of great books" extension is philosophical. (observational)

Network findings are correlational and contested (homophily vs contagion). Treat the influence of your company as directionally real, not deterministic.

Common mistake

Curating an "elevated" reading list while leaving the day’s actual inputs — feeds, idle company — untouched. The baseline is set by the company you keep most hours, not the aspirational kind.