If you have knowledge, let others light their candles in it.

The line urges a generous, non-hoarding attitude toward learning: knowledge is not diminished by being shared, but becomes more powerful when it kindles understanding in others. The candle metaphor suggests both illumination and transmission—one flame can light many without going out—implying that teaching, mentorship, and public intellectual work are ethical uses of one’s education. Attributed to Margaret Fuller, the sentiment aligns with her broader commitments to self-culture, women’s education, and the social responsibilities of the cultivated mind, even if the precise textual origin is uncertain.