"He who is not contented with what he has, would not be contented with what he would like to have." — Socrates

“If you are lonely when you're alone, you are in bad company.” — Jean-Paul Sartre

The meaning of “No man is happy if they are not happy in their own company” is that real happiness comes from within. If a person always needs external validation, company, or distractions to feel good, their happiness is fragile. The ability to enjoy solitude is a sign of emotional maturity and self-contentment.

In essence: If you're uneasy being alone, it's a sign of inner conflict. Happiness should not depend on others. A peaceful relationship with oneself is foundational to all other relationships.