"Fortify yourself with contentment, for this is an impregnable fortress"

This quote by Epictetus, an ancient Greek thinker, suggests that contentment can function as a powerful defense against the difficulties and problems of life. To fortify oneself with contentment suggests to cultivate a sense of inner peace, fulfillment, and gratitude for what one has, rather than constantly striving for more. By doing so, one can develop an "impregnable fortress" that protects versus unfavorable influences, such as envy, greed, and anxiety.

Epictetus believed that satisfaction was vital to living a virtuous and fulfilling life. He argued that true joy does not come from external circumstances or belongings, but from within. By accepting what one can not manage and valuing what one currently has, one can achieve a sense of inner harmony and serenity that is not easily disturbed.

In essence, Epictetus is saying that contentment is an effective tool for psychological durability and strength. It permits us to face life's challenges with a sense of peace and self-confidence, knowing that we have the inner resources to handle whatever comes our way.