My greatest wealth is the deep stillness in which I strive and grow and win what the world cannot take from me with fire or sword.

The line contrasts external, material “wealth” with an inward possession: a cultivated stillness or spiritual composure. In that quiet interior space, the speaker “strive[s] and grow[s] and win[s]” something durable—character, insight, self-mastery, or moral freedom—that cannot be confiscated by violence (“fire or sword”). The phrasing suggests a Stoic-leaning ideal often associated with Goethe in reception: the highest goods are internal and self-formed rather than granted by fortune or protected by force. Read this way, the quote elevates inner development as the only secure form of prosperity, especially amid political upheaval or personal adversity.