(see Daas Chochmah Umussar, vol.3, p.250)

In the Talmud (Pirkei Avos 4:1), Ben Zoma said: Who is wise? He who learns from every person. Who is strong? He who conquers his desires. Who is rich? He who is satisfied with what he has. Who is honored? He who honors others.

The Torah is teaching us to not to seek or demand happiness through any external factors, but rather to depend only on ourselves.

How do we see this concept expressed? The wise man learns from everyone (independent of any intellectual deficiencies in himself); the honorable person honors others (independent of whether others honor him); the wealthy person is satisfied with what he has (independent of how much or little he owns).