According to the Roman Stoic philosopher Musonius Rufus, humans are innately virtuous, but our nature is degraded from childhood by negative socialization. The dominant political and social environment is corrupting to the soul. Bad habits, unconsidered social norms, and negative views of "reality," that we pick up as we go through life, often impede our personal development.
By the time we reach adulthood, we all have accumulated beliefs that our culture imposes on us, including our views on money, pleasure, leisure, and entertainment. We may view minor inconveniences as a hardship, and fear things that are beyond our control. Even if our parents don't model this behavior, peers, the media, and the the culture at large often do. Living in society handicaps us in this regard.
Fortunately, developing a philosophical outlook can correct the effects of negative socialization. Musonius argued that “All of us are so fashioned by nature that we can live our lives free from error and nobly.”